| 7771 | January 18 | Event | 532 – Nika riots in Constantinople fail. |
| 7772 | January 18 | Event | 1126 – Emperor Huizong abdicates the Chinese throne in favour of his son Emperor Qinzong. |
| 7773 | January 18 | Event | 1486 – King Henry VII of England marries Elizabeth of York, daughter of Edward IV. |
| 7774 | January 18 | Event | 1535 – Spanish conquistador Francisco Pizarro founds Lima, the capital of Peru. |
| 7775 | January 18 | Event | 1562 – Pope Pius IV reopens the Council of Trent for its third and final session. |
| 7776 | January 18 | Event | 1591 – King Naresuan of Siam kills Crown Prince Mingyi Swa of Burma in single combat, for which this date is now observed as Royal Thai Armed Forces day. |
| 7777 | January 18 | Event | 1670 – Henry Morgan captures Panama. |
| 7778 | January 18 | Event | 1701 – Frederick I crowns himself King of Prussia in Königsberg. |
| 7779 | January 18 | Event | 1778 – James Cook is the first known European to discover the Hawaiian Islands, which he names the "Sandwich Islands". |
| 7780 | January 18 | Event | 1788 – The first elements of the First Fleet carrying 736 convicts from England to Australia arrive at Botany Bay. |
| 7781 | January 18 | Event | 1866 – Wesley College, Melbourne, is established. |
| 7782 | January 18 | Event | 1871 – Wilhelm I of Germany is proclaimed the first German Emperor in the Hall of Mirrors of the Palace of Versailles (France) towards the end of the Franco-Prussian War. The empire is known as the Second Reich to Germans. |
| 7783 | January 18 | Event | 1884 – Dr. William Price attempts to cremate the body of his infant son, Jesus Christ Price, setting a legal precedent for cremation in the United Kingdom. |
| 7784 | January 18 | Event | 1886 – Modern hockey is born with the formation of The Hockey Association in England. |
| 7785 | January 18 | Event | 1896 – An X-ray generating machine is exhibited for the first time by H. L. Smith. |
| 7786 | January 18 | Event | 1903 – United States President Theodore Roosevelt sends a radio message to King Edward VII: the first transatlantic radio transmission originating in the United States.[citation needed] |
| 7787 | January 18 | Event | 1911 – Eugene B. Ely lands on the deck of the USS Pennsylvania stationed in San Francisco Bay, the first time an aircraft landed on a ship. |
| 7788 | January 18 | Event | 1913 – First Balkan War: A Greek flotilla defeats the Ottoman Navy in the Naval Battle of Lemnos, securing the islands of the Northern Aegean Sea for Greece. |
| 7789 | January 18 | Event | 1915 – Japan issues the "Twenty-One Demands" to the Republic of China in a bid to increase its power in East Asia. |
| 7790 | January 18 | Event | 1916 – A 611-gram chondrite type meteorite strikes a house near the village of Baxter in Stone County, Missouri. |
| 7791 | January 18 | Event | 1919 – World War I: The Paris Peace Conference opens in Versailles, France. |
| 7792 | January 18 | Event | 1919 – Ignacy Jan Paderewski becomes Prime Minister of the newly independent Poland. |
| 7793 | January 18 | Event | 1919 – Bentley Motors Limited is founded. |
| 7794 | January 18 | Event | 1941 – World War II: British troops launch a general counter-offensive against Italian East Africa. |
| 7795 | January 18 | Event | 1943 – Warsaw Ghetto Uprising: The first uprising of Jews in the Warsaw Ghetto. |
| 7796 | January 18 | Event | 1944 – The Metropolitan Opera House in New York City hosts a jazz concert for the first time. The performers are Louis Armstrong, Benny Goodman, Lionel Hampton, Artie Shaw, Roy Eldridge and Jack Teagarden. |
| 7797 | January 18 | Event | 1944 – World War II: Soviet forces liberate Leningrad, effectively ending a three-year Nazi siege, known as the Siege of Leningrad. |
| 7798 | January 18 | Event | 1945 – World War II: Liberation of the Budapest Ghetto by the Red Army. |
| 7799 | January 18 | Event | 1945 – World War II: Liberation of Kraków, Poland by the Red Army. |
| 7800 | January 18 | Event | 1955 – Chinese Civil War: Battle of Yijiangshan Islands is fought. |