2025 – MMXXV
6 January 2025 (London, UK): Welcome to the Global Overview 2025 by Alpha1Strategy, a showcase of some of the forthcoming milestone events in 2025, as launched in the fifth year till the United Nations Agenda 2030, during the G20 Presidency of South Africa in 2025 and during the Decade of Globalising the Overview Effect. (Asterisks * indicate milestone events)
2025:
* 2025 – The 200th Anniversary of London becoming the largest city in the world in 1825, taking over Beijing. (UK, Global)
* 2025 – The 100th Anniversary of New York becoming the largest city in the world in 1925, taking over London. (USA, Global)
* 2025 – 2025 is first square year since 1936, as 2025 is the square of 45. (Global)
* 2025 – The 1700th Anniversary of the Council of Nicea, held from May to the end of July 325, being the first ecumenical council which was the first of many to attain consensus in the Christian Church through an assembly representing all Christendom, including were its official stated settlement of the issue of the Son and the relationship to the Father. (EU, Global)
* 2025 – The 1400th solar anniversary of the Battle of Uhud in Madinah, fought between the early Muslims and the Quraysh, on March 23, 625. (OIC, Global)
* 2025 – The first millennium anniversary of ‘The Canon of Medicine’, an encyclopaedia of medicine in five books compiled by the Persian physician-philosopher Ibn Sina / Avicenna in 1025, regarded as one of the most influential works of its time. (OIC, Global)
* 2025 – The 250th Anniversary of the American Revolutionary War against the British in 1775. (USA, UK)
* 2025 – The 250th Anniversary of Scottish inventor James Watt’s collaboration with investor Matthew Boulton helping to design the first commercial steam engine in 1775, leading to the Industrial Revolution. (UK, Global)
* 2025 – Brazil hosts the COP 30 summit. (Brazil, Africa, UN, Global)
January 2025:
* January 1 – 25-year anniversary, or a Quarter of a Century, since the year 2000. (Global)
* January 1 – Poland takes over the Presidency of the Council of the European Union. (EU)
January 1 – Bulgaria and Romania finalises the process of joining the Schengen Area, lifting land border controls. (EU)
January 1 – The 40th Anniversary of the Internet’s Domain Name System being created in 1985. (Global)
January 1 – The 30th Anniversary of the World Trade Organization (WTO) being established in 1995 to replace the General Agreement on Tariffs and Trade (GATT). (Global)
January 1 – The 75th Anniversary of the Watergate scandal in the USA in 1975, with John N. Mitchell, H. R. Haldeman and John Ehrlichman are found guilty of the Watergate cover-up. (USA)
January 1 – The 100th Anniversary of the official dissolution of the Syrian Federation in 1925, the State of Aleppo and the State of Damascus having been replaced by the State of Syria. (Syria, OIC)
* January 4-9 – State funeral of the 39th President of the USA, Jimmy Carter, following his death on December 29, 2024, with lying in state at the US Capital, a national day of mourning and federal holiday on January 9, the day of Carter’s funeral service. (USA)
January 11 – IFT-7 is scheduled to launch, with the debut of a Block 2 SpaceX Starship. (Space, Global)
January 19 – The proposed ban on video sharing service TikTok is set to take effect in the United States. (USA, Global)
* January 20 – Donald Trump, with his running mate JD Vance, to be sworn in as the 47th President and 50th Vice President of the USA. It also marks the 40th Anniversary of Ronald Reagan being privately sworn in for a second term as US President in 1985 and also the 20th Anniversary of George W. Bush is inaugurated for a second term as US President in 2005, post the 2003 Invasion of Iraq. (USA, Global)
January 20 – The 300th Anniversary of James Figg in 1725 hosting the first recorded international boxing match, fought between English livestock drover Bob Whitaker and Venetian gondolier Alberto di Carni in London. (UK, Global)
January 20 – The 300th Anniversary in Japan in 1725 of the policy of the Gonin Gumi organizing groups of every five households in a town into units collectively responsible for the good behaviour of everyone in the unit, goes into effect as the register of units is completed by the Tokugawa shogunate. (Japan, G7)
January 22 – The 10th Anniversary of Houthi forces seizing the Presidential Palace in Yemen in 2015, with Yemeni President Abd Rabbuh Mansur Hadi resigning after months of unrest. (Yemen, OIC)
* January 23 – The 10th Anniversary of the death of King Abdullah al-Saud of Saudi Arabia in 2015, succeeding by King Salman al-Saud as the new Custodian of the Two Holy Mosques, and Prince Mohammad bin Salman appointed Minister of Defence and Secretary-General of the Royal Court. (Saudi Arabia, OIC)
* January 20-24 – The World Economic Forum is held in Davos-Klosters, Switzerland. (EU, Global)
January 23 – The 75th Anniversary of the Knesset in Tel Aviv passing a resolution that states Jerusalem is its state’s capital in the Holy Land in 1950. (Holy Land, Global)
January 26– The 75th Anniversary of India promulgating its constitution, forming a republic in 1950. (BRICs, India)
January 26-27 – Commemoration of the Night Journey and Ascension of Prophet Muhammad on Rajab 27, with some official holidays. (OIC)
January 27 – The 40th Anniversary of the Economic Cooperation Organization (ECO) being formed in 1985, in Tehran, Iran. (Iran, OIC, Global)
January 31 – The 75th Anniversary of US President Harry S. Truman ordering the development of the hydrogen bomb, in response to the detonation of the Soviet Union’s first atomic bomb in 1949. (USA, Global)
February 2025:
February / September– The 2025 German Federal Election potential schedule period. (Germany, EU)
February 8 – The 300th Anniversary of Catherine I becoming Empress of Russia on the death of her husband, Peter the Great, in 1725. (Russia, BRICs)
February 8 – The 75th Anniversary of the first use of charge card by Diners Club card, in New York, United States in 1950. (USA, Global)
February 10 – The 20th Anniversary of North Korea announcing in 2005 that it possesses nuclear weapons as a protection against the hostility it says it perceives from the United States. (Global)
February 11 – The 50th Anniversary of Margaret Thatcher becoming the leader of the Conservative Party in the UK in 1975, Britain’s first female leader of any political party. (UK)
February 13 – The 30th anniversary of twenty-one Bosnian Serb commanders being charged with genocide and crimes against humanity in the United Nations’ International Criminal Tribunal for the former Yugoslavia in 1995, a tribunal on human rights violations during the Wars in the Balkans. (EU, UN, OIC)
February 14 – The 20th Anniversary of former Lebanese Prime Minister Rafic Hariri being assassinated, along with 21 others, by a suicide bomber in Beirut. (Lebanon, Global)
* February 14 – The 20th Anniversary of YouTube, an American online video sharing and social mediaplatform being launched by Steve Chen, Chad Hurley, and Jawed Karim headquartered in San Bruno, California, and the first video on YouTube being released in April 23, 2005. (USA, Global)
February 16 – The 20th Anniversary of the Kyoto Protocol officially going into effect in 2005. (Global, UN)
* February 23 – The 2025 German Federal Election is scheduled to be held. (Germany, EU)
February 13-23 – The 75th edition of Berlinale International Film Festival is held in Berlin, Germany. (Germany, EU)
* February 19-21 – The Future Investment Initiative (FII) Priority Summit takes place in Miami, USA. (USA, Saudi Arabia)
February 25 – The 30th Anniversary of the Amazon Cooperation Treaty Organization (ACTO) (Organización del Tratado de Cooperación Amazónica [OTCA]) being formed in 1995. (Global)
* February 29 – March 29 – The Islamic holy month of fasting, Ramadan, takes place from Ramadan 1-29/30. (OIC)
March 2025:
March 5–8 – The ancient city sites of Nimrud, Hatra and Dur-Sharrukin in Iraq are demolished by Irhabist group, Daesh. (Iraq, OIC)
March 14 – The 20th Anniversary of China ratifying an anti-secession law in 2005, aimed at preventing Taiwan from declaring independence. (China, BRICs)
* March 23 – The 1400th solar anniversary of the Battle of Uhud in Madinah, fought between the early Muslims and the Quraysh, on March 23, 625. (OIC, Global)
March 25 – The 50th Anniversary of the assassination of King Faisal of Saudi Arabia in 1975. (Saudi Arabia, OIC)
March 25 – The 10th Anniversary of a Saudi Arabia-led coalition of Arab countries starting a military intervention in Yemen in 2015 in order to uphold the Yemeni government in its fight against the Houthis’ southern offensive. (Saudi Arabia, Yemen, OIC)
March 26 – The 30th Anniversary of the Schengen Agreement, easing cross-border travel, going into effect in several European countries in 1995. (EU)
March 11 – The 50th Anniversary of Mikhail Gorbachev becoming General Secretary of the Soviet Communist Party and de facto leader of the Soviet Union in 1985. (Russia, BRICs)
March 11 – The 50th Anniversary of Egyptian businessman Mohamed Al-Fayed buying the London-based department store company Harrods. (UK)
* March 26 – The 25th Anniversary of Vladimir Putin being elected President of Russia in 2000. (Russia, BRICs)
April 2025:
April 2 – The 20th Anniversary of the death of Pope John Paul II in 2005 over 4 million people travel to the Vatican to mourn him. Pope Benedict XVI succeeds him on April 19, becoming the 265th pope. (EU, Global)
April-October – The 100th Anniversary of the ‘Exposition Internationale des Arts Décoratifs et Industriels Modernes’ is held in Paris in 1925, giving a name to the Art Deco style. (EU, Global)
* April – The start of the 250th Anniversary of the American Revolutionary War against the British in 1775. (USA, UK)
* April 1-3 – The end of the Islamic holy month of Ramadan marked by the Eid al-Fitr Holiday period as observed officially in some countries. (OIC)
April 4 – The 50th Anniversary of Bill Gates and Paul Allen founding Microsoft in 1975 in Albuquerque, New Mexico, USA and releasing their Altair BASIC interpreter. (USA, Global)
April 9 – The 20th Anniversary of Charles, Prince of Wales in the UK marrying Camilla Parker Bowles in a civil ceremony at Windsor’s Guildhall in 2005 with Camilla receives the title ‘Duchess of Cornwall.’ (UK)
April 13-October 13 – Expo 2025 set to be held in Osaka, Japan. (Japan, Global)
* April 23 – The 20th Anniversary of the first ever YouTube video being uploaded in 2005, titled ‘Me at the zoo’. (USA, Global)
April 28 – The 75th Anniversary of Jordan formally annexes the West Bank in the Holy Land in 1950. (Holy Land, Global)
April 28 – The 100th Anniversary of Chancellor of the Exchequer Winston Churchill announces Britain’s return to the gold standard in 1925. (UK)
April 28 – The 10th Anniversary of the appointment of Deputy Crown Prince Mohammad bin Salman of Saudi Arabia in 2015. (Saudi Arabia, OIC)
April 30 – The 50th Anniversary of the end of the Vietnam War with the fall of Saigon in 1975, as Communist forces from North Vietnam take over Saigon, resulting in mass evacuation of the remaining American troops and South Vietnam civilians and South Vietnam surrenders unconditionally and is replaced with a temporary Provisional Government. (Vietnam, USA)
April 30 – The 30th Anniversary of the United States government stopping funding of the NSFNET, making the Internet a wholly privatised system. (Global, USA)
May 2025:
* May 1 – The 75th Anniversary of UNRWA, the United Nations Relief and Works Agency for Palestine Refugees in the Near East, beginning operations in the Holy Land in 1950. (Holy Land, Global)
May 5 – The 20th Anniversary of the 2005 United Kingdom General Election being won by the governing Labour Party and its leader Tony Blair being elected for a third consecutive term, following the 2003 Invasion of Iraq. (UK, Global)
May 7 – The 10th Anniversary of the 2015 UK General Election resulting in the first Conservative majority government in 18 years, with its leader David Cameron as Prime Minister, just more than a year later before the Brexit referendum. (UK)
* May 9 – The 75th Anniversary of Robert Schuman in 1950 presenting proposal for the creation of a pan-European organisation, which he believes to be indispensable to the maintenance of permanently peaceful relations between the different nations of the continent, with this proposal, known as the “Schuman Declaration”, being considered to be the beginning of the creation of what is now the European Union. (EU)
May 11 – The 25th Anniversary of India’s population reaching 1 billion in 2000. (India)
May 13-24 – The 78th edition of Festival de Cannes film festival being held in Cannes, France. (France, EU)
May 16 – The 40th Anniversary of scientists of the British Antarctic Survey announcing the discovery of the ozone hole. (UK, Global)
May 21 – Daesh captures the ancient city of Palmyra in Syria. (Syria, OIC)
* May / September – The potential 2025 Australian Federal Election date period. (Australia, G20)
June 2025:
* June – The 71st edition of the Bilderberg Meeting to take place. (EU, Global)
* June – The 95th Annual General Meeting of the Bank of International Settlements is set to take place in Basel, Switzerland. (EU, Global)
* June – The 51st G7 Summit is set to take place in Kananaskis, Alberta, Canada. (Canada, Global)
June 11 – The 50th Anniversary of modern-day Greece being established as the Hellenic Republic in 1975 after a referendum and seven years of military rule. (EU, Global)
June 14 – The 75th Anniversary of the Adhan (Islamic call to prayer) in Arabic being permitted by law in Turkey in 1950, after a ban of 18 years. (Turkey, OIC)
June 14 – The 40th Anniversary of the Schengen Agreement being signed in 1985 between certain member states of the European Economic Community, creating the Schengen Area, a bloc of (at the time) 5 states with no internal border controls. (EU)
* June 14 – The 250th Anniversary of the appointment of George Washington as Commander in Chief of the American Revolutionary War against the British in 1775. (USA, UK)
* June 3-9 – The Islamic pilgrimage of Hajj on 8-12 Dhu al-Hijjah takes place as, as does Day of Arafat on 5 June / 9 Dhu Al-Hijjah as do the holidays for Eid al-Adha from 13-15 Dhu al-Hijjah. (OIC, Global)
* June 15 – July 13 – The 2025 FIFA Club World Cup takes place in the USA. (USA, Global)
June 15– The 75th Anniversary of the start of the Korean War in 1950, when troops and T-34 tanks of the North Korean People’s Army cross the 38th parallel into South Korea. (South Korea, USA, Global)
* June 24 – The 40th Anniversary of Space Shuttle ‘Discovery’ completes its mission in 1985, best remembered for having Prince Sultan bin Salman Al Saud, the first Arab and first Muslim in space, as a payload specialist. (OIC, Saudi Arabia, Global)
June 26 – The 25th Anniversary of a preliminary draft of genomes, as part of the Human Genome Project, being finished in 2000. (USA, Global)
* June 25-26 – The commemoration of the Islamic New Year 1447 on Muharram 1. (OIC, Global)
July 2025:
July – The Sun’s activity is expected to peak, as it reaches solar maximum for the current solar cycle. (Space, Global)
July 1 – The 10th Anniversary of Greece becoming the first advanced economy to miss a payment to the International Monetary Fund in the 71-year history of the IMF in 2015. (EU, Global)
July 2 – The 20th Anniversary of Live 8, a set of 10 simultaneous concerts, taking place throughout the world in 2005, raising interest in the Make Poverty History campaign. (Global)
July 6 – The 20th Anniversary of the International Olympic Committee awarding London the right to host the 2012 Summer Olympics. (UK, Global)
* July 7 – The 20th Anniversary of four coordinated suicide bombings by British Irhabis inspired by al-Qaeda hit central London in 2005, killing 52 people and injuring over 700. (UK, Global)
* July 11–25 – The 25th Anniversary of Camp David II, a summit meeting which took place at Camp David between United States President Bill Clinton, and the political leaders of the Holy Land conflict, Yasser Arafat and Ehud Barak, in 2000, ending without an agreement, but represented the last time in a quarter of a century the political leaders in the Holy Land conflict came face to face for negotiations. (Holy Land, Global)
* June 15 – July 13 – The 2025 FIFA Club World Cup ends in the USA. (USA, Global)
July 13 – The 40 Anniversary of the ‘Live Aid’ benefit concerts in London and Philadelphia in 1985, raising over £50 million for famine relief in Ethiopia. (UK, USA, Global)
* July 1 – Bulgaria is expected to adopt the Euro and become the 21st member state of the Eurozone. (EU)
* July 4-5 – The commemoration of the Islamic date of Ashura on Muharram 10, with some official holidays. (OIC)
* July 6 – The 250th Anniversary of Congress issuing the Declaration of the Causes and Necessity of Taking Up Arms as part of the American Revolutionary War against the British. (USA, UK)
July 18 – The 100th Anniversary of Adolf Hitler publishing Volume 1 of his personal manifesto ‘Mein Kampf’ in Germany. (Germany, EU)
July 20 – The 10th Anniversary of Cuba and the United States, ending 54 years of hostility between the nations, to reestablish full diplomatic relations in 2015. (USA, Cuba)
* July 26 – The 250th Anniversary of the appointment of Benjamin Franklin as Postmaster General of the American Revolutionary War against the British in 1775. (USA, UK)
July 31 – The 10th Anniversary of the International Olympic Committee awarding Beijing the right to host the 2022 Winter Olympics in 2015. (Global, China)
August 2025:
August 7-17 – The 2025 World Games set to take place in Chengdu, China. (China, Global)
* August 15 – The 50th Anniversary of the assassination of Founder President Sheikh Mujibur Rahman of Bangladesh during a coup led by Major Syed Faruque Rahman. (Bangladesh, OIC)
* August 18 – The 200th Anniversary of the Panic of 1825, the first modern stock market crash, in England. (UK, Global)
* August 23 – The 250th Anniversary of King George III of Great Britain declaring the American colonies in rebellion. (USA, UK)
September 2025:
September 1 – The 25th Anniversary of the release of the Nokia 3310 mobile phone in 2000. (Global)
* September 3-4 – Commemoration of the birth date of Prophet Muhammad on 12 Rabi al-Awwal, with some official holidays. (OIC)
* September 4 – The 1500th Anniversary and the 3rd. (Global)
* September 5 – The 20th Anniversary of Alpha1Media founder Talal Malik commencing tenure on Reuters Editorial Training Programme at Reuters New Global Headquarters in Canary Wharf, London, UK, in 2005, selected as the only man from 1,200 candidates for the same writing training programme as James Bond author, Ian Fleming. (UK, Global)
September 6-8 – The 25th Anniversary of the Millennium Summit at U.N. Headquarters in 2000. (Global)
September 9 – The 10th Anniversary of Queen Elizabeth II, having been on the throne for 63 years, 217 days, becoming the longest-reigning British monarch in history and the longest-serving head of state of any nation in modern history in 2005. (UK, Global)
September 13 – The 30th Anniversary. (Global)
* September 9-23 – The 80th session of the UN General Assembly (UNGA 80) opens on September 9 in New York, USA, with first day of the high-level General Debate on September 23. (UN, Global)
September 12 – The 20th Anniversary of political leader in the Holy Land Conflict Ariel Sharon’s-led army demolishing multiple settlements and withdrawing its army from the Gaza Strip in 2005. (Holy Land, Global)
September 19 – The 20th Anniversary of North Korea agreeing to stop building nuclear weapons in exchange for aid and cooperation in 2005. (Global)
September 22 – The 10th Anniversary. (UK, Global)
September 24 – The 10th Anniversary of the deadliest crowd crush during the Hajj pilgrimage in Makkah in 2015, which kills at least 2,200 people and injures more than 900 others, with more than 650 missing. (Global, Saudi Arabia, OIC)
* September 27 – The 200th Anniversary of the world’s first modern railway, the Stockton and Darlington Railway, opening in England in 1825. (UK, Global)
* September 28 – The 25th Anniversary of political opposition leader in the Holy Land Conflict Ariel Sharon visiting al-Haram al-Sharif / Temple Mount in East Jerusalem in 2000, sparking an uprising that becomes the Second Intifada. (Holy Land)
* September 30 – The 20th Anniversary of the controversial drawings attempting to negatively depict the founder of Islam, Prophet Muhammad, being printed in the Danish newspaper, ‘Jyllands-Posten’, in 2005, sparking outrage and violent riots by Muslims around the world as blasphemy against their religion. (Global, EU, OIC)
October 2025:
October 1 – The 50th Anniversary of GOAT Boxer Muhammad Ali defeating Joe Frazier in a boxing match in Manila, Philippines in 1975 called “Thrilla in Manila”, being is viewed live by well over 100 million people worldwide. (Global)
* October 2 – The 100th Anniversary of Scottish inventor John Logie Baird successfully transmitting the first television pictures with a greyscale image in 1925. (UK, Global)
* October 3 – The 20th Anniversary of Croatia and Turkey’s officially starting accession negotiations to the European Union in 2005, with Croatia joining on July 1, 2013, and Turkey still not a member. (EU, Turkey)
* October 17-19 – The 2025 Annual Meetings of the World Bank Group and the International Monetary Fund (IMF) set to take place Washington, D.C., USA. (Global)
October 19 – The 20th Anniversary of the trial of former President of Iraq Saddam Hussein beginning in 2005. (Iraq, Global)
* October – The 150th Anniversary of the Ottoman state declaring partial bankruptcy, and placing its finances in the hands of European creditors. (Turkey, OIC)
* October – The 9th edition of the Future Investment Initiative, the flagship conference of the Public Investment Fund, takes place in Riyadh, Saudi Arabia. (Saudi Arabia, OIC)
* October 20 – The latest date for the 2025 Canadian Federal Election will be held no later than this date. (Canada)
* October 25 – The 40th Anniversary of Emirates Airlines being established in Dubai in 1985 and making its first flight, to Karachi, Pakistan. (UAE, OIC, Global)
* October 26 – The 2025 Argentine legislative election is scheduled to be held. (Argentina)
October 26 – The 50th Anniversary of Juan Carlos I of Spain becoming acting head of state in 1975 after General Francisco Franco concedes that he is too ill to govern. (Spain, EU)
November 2025:
* November – The 30th Anniversary of the Indian government officially renaming the city of Bombay in 1995, restoring the name Mumbai. (India)
* November – The inaugural edition of Metropolis is set to take place. (Global)
November 4 – Political leader in the Holy Land Conflict Yitzhak Rabin is assassinated at a peace rally in Tel Aviv in the Holy Land. (Holy Land, Global)
November 7 – The 25th Anniversary of the 2000 United States Presidential Election with no winner being declared, prompting a controversial recount in Florida. (USA)
November 9 – The 20th Anniversary of the 2005 Amman coordinated suicide bombings by al-Qaeda in Iraq in which at at 60 people are killed and 115 more are wounded in series of attacks across Amman, Jordan, including the death of Syrian-American film producer and director, Mustapha Akkad, world-famous for his films, ‘The Message’ and ‘Lion of the Desert’. (Jordan, Global)
November 13 – The 10th Anniversary of multiple terrorist attacks claimed by Daesh in Paris, France, in 2015, resulting in 130 fatalities. (Global, OIC, EU)
* November 20 – The 40th anniversary of Microsoft releasing the first U.S. release of Windows 1.0 in 1985. (USA, Global)
November 21 – The 30th Anniversary of the Dayton Agreement to end the Bosnian War being reached at Wright-Patterson Air Force Base near Dayton, Ohio, United States in 1995 (signed December 14). (EU, UN, OIC, Global)
November 22 – The 20th Anniversary of Angela Merkel assuming office as the first female Chancellor of Germany in 2005. (EU)
November 22 – The 50th Anniversary of Juan Carlos being declared King of Spain following the death of General Francisco Franco in 1975, reigning until his abdication in 2014. (Spain, EU)
* November 22-23 – South Africa will host the G20 summit, the first nation in Africa to do so, in Johannesburg.(South Africa, Global)
* November 24-26 – The inaugural edition of Metropolis is set to take place. (Global)
November 25 – The 500th Anniversary of Charles V, Holy Roman Emperor acting in his capacity as the King of Spain, issuing an edict in 1525 ordering the expulsion or conversion of the remaining Muslims in the Crown of Aragon, similar to that issued for the Crown of Castile by Queen Isabella in 1502, which applies to the Kingdom of Valencia and the Principality of Catalonia. (OIC, EU)
November 26 – The 150th anniversary of the news in 1875 that Egyptian leader Ismail Pasha has sold Egypt’s 44% share in the Suez Canal to Britain, in a deal secured by British Prime Minister Benjamin Disraeli, without the prior sanction of the British Parliament. (Global, UK, Egypt)
December 2025:
December 1 – The 40yh anniversary of Organization of Ibero-American States for Education, Science and Culture (Spanish: Organización e Estados Iberoamericanos para la Educación la Ciencia y la Cultura; OEI) being created in 1985. (Global)
December 8 – The 40th anniversary of the South Asian Association for Regional Cooperation (SAARC) being stablished in 1985. (Global)
December 8 – The 500th Anniversary of a second edict being issued in Spain directing Spanish Muslims to show proof of baptism as Christians or to leave by the deadline of December 31, 1525, (for Valencia) or January 26, 1525 (for Aragon and Catalonia). (OIC, EU)
* December 11 – The 10th Anniversary of the founding of OpenAI, a non-profit artificial intelligence research company in 2015. (USA, Global)
December 12 – The 25th Anniversary of the United States Supreme Court ruling in 2000 that the recount of the 2000 Presidential Election in Florida should be halted and the original results be certified, thus making George W. Bush the winner of the U.S. Presidential Election. (USA)
December 12 – The 10th Anniversary of a global climate change pact being agreed at the COP 21 summit in Paris, France, in 2005, committing all countries to reduce carbon emissions for the first time. (Global, EU)
* December 15 – The 10th Anniversary of Deputy Crown Prince and Defence Minister Mohammad bin Salman of Saudi Arabia establishing the Islamic Military Counter Terrorism Coalition (IMCTC), a Saudi-led Islamic alliance against terrorism in 2015. (Saudi Arabia, OIC)
December 22 – The 10th Anniversary of SpaceX landing an uncrewed Falcon 9 rocket in 2015, the first reusable rocket to successfully enter orbital space and return. (USA, Space, Global)
* December 26 – The 20th Anniversary of the official TV launch of Alpha1Estates, and its milestone projects in Saudi Arabia, by Founder Talal Malik in 2005. (UK, Saudi Arabia, Global)
December 31 – The 500th anniversary of the deadline on December 31, 1525, for Spanish Muslims to convert to Christianity in the Valencia is reached, after which remaining Muslims, or those who harbour them as fugitives, becomes punishable by forced exile, imprisonment or death. (OIC, EU)
December 31 – The end of the first quarter of the 21st century. (Global)