Hutton Gibson is a Traditionalist Catholic. He goes farther than many, however, embracing Sedevacantism. He has also stated that the Second Vatican Council was illegitimate due to the heresies it produced, and that it was the result of a secret anti-Catholic plot orchestrated by both Masons and Jews. It has been incorrectly claimed that Hutton Gibson holds to the Siri Thesis.
Because Gibson's views are consistently critical of the Jews, and is a proponent of bizarre and historically false conspiracy theories about the Jews and their role in history, Hutton Gibson is widely considered to be an anti-semite.
Gibson also holds to the claim that the September 11, 2001 terrorist attacks were not carried out mostly by Muslims aboard the plane, but rather were carried out by "remote control" by Zionists.