Avenue Q is a musical conceived by Robert Lopez and Jeff Marx, who wrote the music and lyrics, and directed by Jason Moore. The book is by Jeff Whitty. The show was produced by and opened at the Off-Broadway Vineyard Theatre in March 2003. The production transferred to Broadway in July 2003 and won several Tony Awards, including the award for Best Musical. The show has spawned a 2005 Las Vegas production, a 2006 West End production and various international productions. An Australian national tour began in June 2009 and will end in June 2010.

The show is largely inspired by (and is in the style of) Sesame Street; most of the characters in the show are puppets (operated by actors onstage), the set depicts several tenements on a rundown street in an Outer Borough of New York City, both the live characters and puppet characters sing, and short animated video clips are played as part of the story.