An Honest Liar is a 2014 biographical feature film documentary, directed and produced by Justin Weinstein and Tyler Measom, written by Weinstein, Greg O'Toole and Measom, produced through Left Turn Films, Pure Mutt Productions and Part2 Filmworks, and distributed by Abramorama. The film documents the life of former magician, escape artist, and skeptical educator James Randi, in particular the investigations through which he publicly exposed psychics, faith healers, and con-artists. The film also focuses on Randi's relationship with his partner of 25 years, José Alvarez, who at the time of filming, had been discovered to be living under a false identity, calling into question "whether Randi was the deceiver or the deceived."

The film was screened at a number of 2014 film festivals, including the Tribeca Film Festival, Hot Docs, and AFI Docs Festival, where it won the Audience Award for Best Feature. It was released in February 2015.