Marriage on the Rocks is a 1965 comedy film starring Frank Sinatra, Deborah Kerr, and Dean Martin about a businessman's wife who ends up divorced by mistake and then married to his best friend by an even bigger mistake. The film was written by Cy Howard and directed by Jack Donohue.

Marriage on the Rocks is not a musical, even though it pairs Sinatra and Martin. The picture would be their last feature film partnership for nearly 20 years, when they appeared together briefly in 1984's Cannonball Run II.