Les Misérables, colloquially known as Les Mis or Les Miz, is a musical composed in 1980 by the French composer Claude-Michel Schönberg with a libretto by Alain Boublil. Sung through, it is perhaps the most famous of all French musicals and one of the most performed musicals worldwide. On October 8, 2006, the show celebrated its 21st anniversary and became the longest-running West End musical in history and is still running (though it has changed venues).

Among the most famous songs of this Tony award-winning musical are "I Dreamed a Dream", "One Day More", "A Heart Full of Love", "Stars", "Bring Him Home", "Do You Hear the People Sing?", "Master of the House", and "On My Own."

The musical is based on the 1862 novel Les Misérables by Victor Hugo. Set in early 19th century France, it follows the intertwining stories of a cast of characters as they struggle for redemption and revolution. The characters include a paroled convict named Jean Valjean who, failing attempts to find work as an honest man with his yellow ticket of leave, breaks his parole and conceals his identity; the police inspector Javert who becomes obsessed with finding Valjean; Fantine, the single mother who is forced to become a prostitute to support her daughter; Cosette, who eventually falls in love with a French student named Marius Pontmercy. After Fantine dies, Cosette becomes Jean Valjean's adopted daughter; the Thénardiers, the unscrupulous innkeepers who thrive on cheating and stealing; Éponine, their young daughter who is hopelessly in love with Marius; Gavroche, a young beggar boy; and student leader Enjolras who plans the revolt to free the oppressed lower classes of France. The main characters are joined by an ensemble that includes prostitutes, student revolutionaries, factory workers, and others.