Grease is a 1972 musical by Jim Jacobs and Warren Casey.

This show takes its name from the 1950s United States working-class youth subculture known as the greasers. The musical, set in 1959 at fictional Rydell High School (loosely based on William Howard Taft High School (Chicago)), follows a group of working-class kids as they navigate the complexities of love, cars, and drive-ins. The score attempts to re-create the sounds of early rock and roll in its record-breaking original Broadway production.

At the time it closed in 1980, Grease's 3388-performance run was the longest yet in Broadway history, although surpassed by A Chorus Line a few years later. It went on to become a West End hit, a hugely successful film, a popular 1994 Broadway revival, and a staple of regional theatre, summer stock, community theatre, and high school and middle school drama groups. It remains Broadway's twelfth longest running show.