The 3rd Voice is a 1960 American neo noir thriller crime drama film directed and written by Hubert Cornfield, who also produced the film with Maury Dexter. It is based on the novel All the Way by Charles Williams and stars Edmond O'Brien, Laraine Day, and Julie London.

Charles K. Williams was an American author of crime fiction. He is regarded by some critics as one of the finest suspense novelists of the 1950s and 1960s. His 1951 debut, the paperback novel Hill Girl, sold more than a million copies. A dozen of his books have been adapted for movies, most popularly Dead Calm and The Hot Spot.