I've Got a Secret is an American panel game show produced by Mark Goodson and Bill Todman for CBS television. Created by comedy writers Allan Sherman and Howard Merrill, it was a derivative of Goodson–Todman's own panel show, What's My Line?. Instead of celebrity panelists trying to determine a contestant's occupation, however, as in What's My Line, the panel tried to determine a contestant's secret: something that is unusual, amazing, embarrassing, or humorous about that person.

The original version of I've Got a Secret premiered on CBS on June 19, 1952, and ran until April 3, 1967. The show began broadcasting in black and white and switched to color in 1966, when all commercial prime-time network programs in the US began to be produced in color.

The show was revived for the 1972–1973 season in once-a-week syndication and again from June 15 to July 6, 1976, as a summer replacement series on CBS. Oxygen launched a daily revival series in 2000, which ran until 2001. A second revival by GSN premiered on April 17, 2006, and aired new episodes daily until June 9, 2006.