March of the Falsettos is a 1981 musical with book, lyrics, and music by William Finn. It is the second in a trilogy of musicals, preceded by In Trousers and followed by Falsettoland. March of the Falsettos and Falsettoland later formed the first and second act respectively of the 1992 musical Falsettos.

William Alan Finn is an American composer and lyricist. He is best known for his musicals, which include Falsettos, for which he won the 1992 Tony Awards for Best Original Score and Best Book of a Musical, A New Brain (1998), and The 25th Annual Putnam County Spelling Bee (2005).