Gaby is a 1956 American drama film directed by Curtis Bernhardt and starring Leslie Caron, John Kerr, Cedric Hardwicke, Taina Elg and Margalo Gillmore. It is the third version of the 1930 play Waterloo Bridge, previously made into films Waterloo Bridge (1931) and Waterloo Bridge (1940). It is the only version of the play made in color, and the least faithful to it. The title, the names of the main characters, and plot details were all changed. Unlike the 1931 and 1940 versions, this film ends happily.

This version was made by MGM and produced by Edwin H. Knopf. The screenplay was by Albert Hackett, Frances Goodrich and Charles Lederer, based on the screenplay of Waterloo Bridge (1940) by S. N. Behrman, Paul H. Rameau and George Froeschel. All three versions were based on the play by Robert E. Sherwood.