Miss Saigon is a West End musical by Claude-Michel Schönberg and Alain Boublil, with lyrics by Boublil and Richard Maltby, Jr. It premiered at the Theatre Royal, Drury Lane, in London on September 20, 1989, closing after 4,264 performances on October 30, 1999. On April 11, 1991, it opened at the Broadway Theatre in New York City, and closed on January 28, 2001 after 4,092 performances. The musical represented Schönberg and Boublil's second major success, following Les Misérables in 1980. As of August 2007, Miss Saigon is still the 10th longest-running Broadway musical in musical theatre history.

Miss Saigon is a modern adaptation of Giacomo Puccini's opera Madame Butterfly, and similarly tells the tragic tale of a doomed romance involving an Asian woman abandoned by her American lover. The setting of the plot is relocated to the 1970s Saigon during the Vietnam War, and Madame Butterfly's American Lieutenant and Japanese geisha coupling is replaced by a romance between an American GI and a Vietnamese bar girl.

The show's inspiration was reportedly a photograph, inadvertently found by Schönberg in a magazine. The photo showed a Vietnamese mother leaving her child at a departure gate at Tan Son Nhut Air Base to board a plane headed for the United States where her father, an ex-GI, would be in a position to provide a much better life for the child. Schönberg considered this mother's actions for her child to be "The Ultimate Sacrifice," an idea central to the plot of Miss Saigon.

Highlights of the show include the evacuation of the last Americans in Saigon from the Embassy roof by helicopter while a crowd of abandoned Vietnamese scream their despair, the victory parade of the new communist regime and the frenzied night club scene on the edge of defeat.

Miss Saigon was part of the major British influence on Broadway in the 1980s, along with the musicals Cats, The Phantom of the Opera, and Les Misérables.