To Tell the Truth is an American television panel show in which four celebrity panelists are presented with three contestants (the "team of challengers", each an individual or pair) 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.

The show was created by Bob Stewart and originally produced by Mark Goodson–Bill Todman Productions. It aired—both on the CBS television network, from 1956 to 1968, and in syndication, from 1969 to 1978—and has been revived several times since then, reaching a total of 31 seasons by 2021. The original host was Bud Collyer, who hosted the show during its CBS years from 1956 to 1968. He was replaced by Garry Moore when the show moved to syndication in 1969, and stayed the host into 1977, though Moore's health trouble resulted in a number of guest hosts during his tenure, and led to his eventual retirement, to be replaced on a permanent basis as host by Joe Garagiola, a former panelist and frequent guest host. Garagiola hosted until the show was cancelled in 1978.

Robin Ward hosted a 1980–1981 syndicated revival of the program, and a 1990–1991 revival on the NBC network featured a succession of different hosts - Gordon Elliott, Lynn Swann and Alex Trebek. The show was revived again in syndication from 2000 to 2002 and hosted by John O'Hurley. The most recent iteration is now on the ABC network and has been hosted by Anthony Anderson since 2016.