This is a list of selected April 24 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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- Events listed on the Main Page are selected based on article quality and to provide a diverse range of topics, rather than solely on the importance or significance of the events.
- Only four or five events are featured each day; therefore, not all important or significant events can be included.
- An event is generally excluded if it is already the subject of the scheduled featured article or picture of the day.
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April 24: Arbor Day in the United States (2009); Republic Day in the Gambia; Genocide Remembrance Day in Armenia
- 1479 BC – Thutmose III became the sixth Pharaoh of the Eighteenth Dynasty of Egypt according to the official chronology, although during the first 22 years of the reign he was co-regent with his aunt, Hatshepsut.
- 1800 – The Library of Congress (pictured), today the de facto national library of the United States, was established as part of an act of Congress providing for the transfer of the nation's capital from Philadelphia to Washington, D.C.
- 1877 – Unable to resolve a series of disputes over the Balkans in the aftermath of the 1876 Bulgarian April Uprising, Russia declared war on the Ottoman Empire, starting the Russo-Turkish War.
- 1915 – The Armenian Genocide in the Ottoman Empire began with the arrest and deportation of hundreds of prominent Armenians in Constantinople.
- 1916 – Irish republicans led by teacher and political activist Patrick Pearse began the Easter Rising, a rebellion against British rule in Ireland, and proclaimed the Irish Republic an independent state.
- 1990 – The Hubble Space Telescope was launched aboard the Space Shuttle Discovery in mission STS-31.