The Man in the Gray Flannel Suit is a 1956 American drama film starring Gregory Peck and Jennifer Jones, with Fredric March, Lee J. Cobb, Keenan Wynn and Marisa Pavan in support. Based on the 1955 novel by Sloan Wilson, it was written and directed by Nunnally Johnson, and focuses on Tom Rath, a young World War II veteran trying to balance the pressures of his marriage to an ambitious wife and growing family with the demands of a career while dealing with ongoing after-effects of his war service and a new high-stress job.

The film was entered at the 1956 Cannes Film Festival.