This is a list of selected April 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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April 23: Take Our Daughters and Sons to Work Day (United States, 2009); World Book and Copyright Day; St George's Day in various countries; Children's Day in Turkey.
- 1348 – The first-ever appointments of the Order of the Garter, an order of chivalry, founded by King Edward III of England, that is today presently bestowed on recipients in the United Kingdom and other Commonwealth realms, were announced.
- 1661 – Charles II was crowned King of England, Ireland, and Scotland at Westminster Abbey.
- 1827 – Irish mathematician and physicist William Rowan Hamilton (pictured) presented his Theory of Systems of Rays.
- 1954 – Batting against Vic Raschi of the St. Louis Cardinals, Hank Aaron of the Milwaukee Braves hit the first of his then-record 755 home runs in Major League Baseball.
- 1961 – Dressed in his 1940s-vintage general's uniform, President Charles de Gaulle delivered a televised speech calling on the military personnel and civilians of France to oppose the Algiers putsch, a coup d'état attempt against him.