This is a list of selected June 26 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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- Only four or five events are featured each day; therefore, not all important or significant events can be included.
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June 26: Armed Forces Day in the United Kingdom (2010); Flag Day in Romania; Sunthorn Phu Day in Thailand
- 1409 – In an attempt to end the Western Schism, during which Gregory XII in Rome and Benedict XIII in Avignon simultaneously claimed to be the true pope, the Council of Pisa instead ended up electing a third one, Alexander V.
- 1541 – Spanish conquistador Francisco Pizarro (pictured) was assassinated in Lima by supporters of his rival Diego de Almagro's son.
- 1918 – World War I: The 26-day Battle of Belleau Wood near the Marne River in France ended with American forces finally clearing that forest of German troops.
- 1945 – At a conference in San Francisco, delegates from 50 nations signed a charter establishing the United Nations.
- 2008 – The U.S. Supreme Court delivered its decision in District of Columbia v. Heller, ruling that the Second Amendment to the U.S. Constitution protects an individual's right to keep and bear arms for private use in Washington, D.C., and other federal enclaves.