This is a list of selected October 23 anniversaries that appear in the "On this day" section of the Main Page. To suggest a new item, in most cases, you can be bold and edit this page. Before doing so, please review the selected anniversaries guidelines. If your suggestion is potentially controversial or relates to a day currently or soon to appear on the Main Page, post it on the talk page instead.
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October 23: National Day in Hungary (1956); Chulalongkorn Memorial Day in Thailand
- 425 – Valentinian III became Emperor of the Western Roman Empire at the age of six.
- 1642 – The Battle of Edgehill, the first pitched battle of the First English Civil War between the Royalists and the Parliamentarians, was fought to an inconclusive result near Edge Hill and Kineton in southern Warwickshire.
- 1739 – Great Britain declared war on Spain, starting the War of Jenkins' Ear.
- 1956 – The Hungarian Revolution (demonstrations pictured) began as a peaceful student demonstration which attracted thousands as it marched through central Budapest to the Parliament building.
- 1972 – Operation Linebacker, a US bombing campaign against North Vietnam in response to its Easter Offensive, ended after five months.
- 1983 – Lebanese Civil War: Suicide bombers destroyed two barracks in Beirut, Lebanon, killing 241 U.S. servicemen and 58 French paratroopers of the international peacekeeping force.
More anniversaries: