To Tell the Truth is an American television panel show in which four celebrity panelists are presented with three contestants and must identify which is the "central character" whose unusual occupation or experience has been read aloud by the show's moderator/host. When the panelists question the contestants, the two impostors may lie whereas the "central character" must tell the truth. The setup adds the impostor element to the format of What's My Line? and I've Got a Secret.

A panel show or panel game is a radio or television game show in which a panel of celebrities participate. Celebrity panelists may compete with each other, such as on The News Quiz; facilitate play by non-celebrity contestants, such as on Match Game and Blankety Blank; or do both, such as on Wait Wait Don't Tell Me. The genre can be traced to 1938, when Information Please debuted on U.S. radio. The earliest known television panel show is Play the Game, a charades show in 1946. The modern trend of comedy panel shows can find early roots with Stop Me If You've Heard This One in 1939 and Can You Top This? in 1940. While panel shows were more popular in the past in the U.S., they are still very common in the United Kingdom.