Jack Cashill (born December 15, 1947) is an American author, blogger and conspiracy theorist.

[1][2][3] He is a weekly contributor to WorldNetDaily and Executive Editor of Ingram's Magazine, a business publication based in Kansas City, Missouri.

[8] TWA 800: The Crash, The Cover Up, The Conspiracy, a book written by Cashill, was published in July 2016 by Regnery.

The Pitch described Cashill as a conspiracy theorist; he promotes the theory that TWA 800 was hit by a missile and doubted the veracity of Barack Obama's published birth certificate.

[3] First Strike (2003), Cashill's earlier book on the crash of TWA Flight 800, alleged the real cause had been covered up to stop Bill Clinton from losing the 1996 presidential election.