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Many individuals were directly responsible for the September 11, 2001 attacks. According to nearly all reputable sources, including the 9/11 Commission Report, the attack was planned and carried out by al-Qaida operatives. This article describes those operatives.
It can be argued that others were indirectly responsible for the attacks, by implementing lax security or by turning a blind eye to possible threats, but that is outside the scope of this article. In addition, there exist other less accepted theories regarding culpability for the attacks. These are described in the articles 9/11 domestic conspiracy theory and Misinformation and rumors about the September 11, 2001 attacks.