This is a list of selected August 3 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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August 3: Independence Day in Niger (1960); Flag Day in Venezuela
- 435 – Nestorius, the originator of Nestorianism, was exiled by Byzantine Emperor Theodosius II to a monastery in Egypt.
- 1916 – Irish nationalist Sir Roger Casement was hanged at London's Pentonville Prison for treason for his role in the Easter Rising, a rebellion to win Irish independence from Britain.
- 1948 – Before the House Un-American Activities Committee of the United States House of Representatives, former spy turned government informer Whittaker Chambers (pictured) accused U.S. State Department official Alger Hiss of being a communist and a Soviet spy.
- 1949 – The Basketball Association of America agreed to merge with the National Basketball League to form the National Basketball Association.
- 1960 – Niger officially gained independence from France as part of the decolonization of the French Community.
- 2005 – President Maaouya Ould Sid'Ahmed Taya of Mauritania was overthrown in a military coup while he was attending the funeral of King Fahd in Saudi Arabia.