Inside 9/11 is a three-part television documentary film produced by Towers Productions that premiered on August 21 and August 22, 2005, on the National Geographic Channel. The program covers the September 11 attacks in 2001, the events that led to it, and its aftermath. The first part consisted of examining, event by event, the build-up towards September 11. The second part consisted of the events of 9/11 itself and the aftermath. Experts and eyewitnesses provide their accounts of the attacks, and the events are covered in chronological order.

Inside 9/11 was the highest-rated program ever on the National Geographic Channel and was nominated for an Emmy in 2006.On August 27, 2006, the documentary was released again with details about Zacarias Moussaoui and Able Danger.

On May 7, 2011, the third part was released with details on the death of Osama bin Laden and the rise of attacks inspired by other leaders such as Anwar al-Awlaki, who is suspected of preparing three of the 9/11 hijackers in San Diego and Virginia.