| 139711 | December 11 | Event | 969 – Byzantine Emperor Nikephoros II Phokas is assassinated by his wife Theophano and her lover, the later Emperor John I Tzimiskes. |
| 139712 | December 11 | Event | 1282 – Battle of Orewin Bridge: Llywelyn ap Gruffudd, the last native Prince of Wales, is killed at Cilmeri, near Builth Wells, in mid-Wales. |
| 139713 | December 11 | Event | 1602 – A surprise attack by forces under the command of Charles Emmanuel I, Duke of Savoy, and his brother-in-law, Philip III of Spain, is repelled by the citizens of Geneva. (Commemorated annually by the Fête de l'Escalade.) |
| 139714 | December 11 | Event | 1688 – Glorious Revolution: James II of England, while trying to flee to France, allegedly throws the Great Seal of the Realm into the River Thames. |
| 139715 | December 11 | Event | 1789 – The University of North Carolina is chartered by the North Carolina General Assembly. |
| 139716 | December 11 | Event | 1792 – French Revolution: King Louis XVI of France is put on trial for treason by the National Convention. |
| 139717 | December 11 | Event | 1815 – The U.S. Senate creates a select committee on finance and a uniform national currency, predecessor of the United States Senate Committee on Finance. |
| 139718 | December 11 | Event | 1816 – Indiana becomes the 19th U.S. state. |
| 139719 | December 11 | Event | 1868 – Paraguayan War: Brazilian troops defeat Paraguayan at the Battle of Avay. |
| 139720 | December 11 | Event | 1905 – A workers' uprising occurs in Kiev, Ukraine (then part of the Russian Empire), and establishes the Shuliavka Republic. |
| 139721 | December 11 | Event | 1907 – The New Zealand Parliament Buildings are almost completely destroyed by fire. |
| 139722 | December 11 | Event | 1917 – World War I: British General Edmund Allenby enters Jerusalem on foot and declares martial law. |
| 139723 | December 11 | Event | 1920 – Irish War of Independence: In retaliation for an IRA ambush, British forces burn and loot numerous buildings in Cork city. Many civilians also reported being beaten, shot at, robbed and verbally abused by British forces. |
| 139724 | December 11 | Event | 1925 – Roman Catholic papal encyclical Quas primas introduces the Feast of Christ the King. |
| 139725 | December 11 | Event | 1927 – Guangzhou Uprising: Communist Red Guards launch an uprising in Guangzhou, China, taking over most of the city and announcing the formation of a Guangzhou Soviet. |
| 139726 | December 11 | Event | 1931 – Statute of Westminster 1931: The British Parliament establishes legislative equality between the UK and the Dominions of the Commonwealth—Australia, Canada, Newfoundland, New Zealand, South Africa, and Ireland. |
| 139727 | December 11 | Event | 1934 – Bill Wilson, co-founder of Alcoholics Anonymous, takes his last drink and enters treatment for the last time. |
| 139728 | December 11 | Event | 1936 – Abdication Crisis: Edward VIII's abdication as King of the United Kingdom and the British Dominions beyond the Seas, and Emperor of India, becomes effective. |
| 139729 | December 11 | Event | 1937 – Second Italo-Ethiopian War: Italy leaves the League of Nations. |
| 139730 | December 11 | Event | 1941 – World War II: Germany and Italy declare war on the United States, following the Americans' declaration of war on the Empire of Japan in the wake of the attack on Pearl Harbor. The United States, in turn, declares war on them. |
| 139731 | December 11 | Event | 1941 – World War II: Poland declares war on the Empire of Japan. |
| 139732 | December 11 | Event | 1946 – The United Nations International Children's Emergency Fund (UNICEF) is established. |
| 139733 | December 11 | Event | 1948 – 1948 Arab–Israeli War: The United Nations passes General Assembly Resolution 194, creating a Conciliation Commission to mediate the conflict. |
| 139734 | December 11 | Event | 1958 – French Upper Volta and French Dahomey gain self-government from France, becoming the Republic of Upper Volta and the Republic of Dahomey (now Benin), respectively, and joining the French Community. |
| 139735 | December 11 | Event | 1960 – French forces crack down in a violent clash with protesters in French Algeria during a visit by French President Charles de Gaulle. |
| 139736 | December 11 | Event | 1962 – Arthur Lucas, convicted of murder, is the last person to be executed in Canada. |
| 139737 | December 11 | Event | 1964 – Che Guevara speaks at the United Nations General Assembly in New York City. |
| 139738 | December 11 | Event | 1968 – The Rolling Stones Rock and Roll Circus, featuring the Rolling Stones, Jethro Tull, the Who, Taj Mahal, Marianne Faithfull, and the Dirty Mac with Yoko Ono, is filmed in Wembley, London. |
| 139739 | December 11 | Event | 1972 – Apollo 17 becomes the sixth and last Apollo mission to land on the Moon. |
| 139740 | December 11 | Event | 1978 – The Lufthansa heist is committed by a group led by Lucchese family associate Jimmy Burke. It was the largest cash robbery ever committed on American soil, at that time. |