The September 11 attacks were a series of four coordinated terrorist attacks in the United States on September 11, 2001.

September 11 attacks may also refer to:

• The massacre of Drogheda during the British Cromwellian conquest of Ireland, from 3rd to 11th September 1649
• Mountain Meadows Massacre in Utah, from September 7 to 11, 1857
• 1973 Chilean coup d'état, on September 11, 1973
• 2012 Benghazi attack, an assault on American facilities in Libya on September 11, 2012

• September 11
• 911 (disambiguation)

This disambiguation page lists articles associated with the title September 11 attacks.
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