In 2002, he published the controversial work on the September 11 terrorist attacks--9/11: The Big Lie--in which Meyssan argues that such attacks were organized by a faction of what he calls "the US military industrial complex" in order to impose a military regime. The book was translated into 28 languages;[3] it was followed by Le Pentagate, a book arguing that the attack against the Pentagon was not carried out by a commercial airliner but a missile.

The central thesis of Le Pentagate, that a Boeing 757 did not hit The Pentagon, has been heavily criticised by other prominent 9/11 conspiracists such as Jim Hoffman.[4][5][6]

He started a campaign at the United Nations to initiate an international investigation commission to revisit the general consensus regarding the 9/11 attacks, but he was not able to reach his objective. There was little support, except from the Arab League and the Gulf Cooperation Council.

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