"King Rat" is a song by indie rock band Modest Mouse and appears as the title track to their fifth promotional single, following "The World At Large". The single was later released on the band's 2009 EP No One's First, and You're Next. The promo also features the song "Fire It Up" from their 2007 album We Were Dead Before the Ship Even Sank.

Modest Mouse is an American rock band formed in 1993 in Issaquah, Washington, and currently based in Portland, Oregon. The founding members were lead singer/guitarist Isaac Brock, drummer Jeremiah Green and bassist Eric Judy. They achieved critical acclaim for their albums The Lonesome Crowded West (1997) and The Moon & Antarctica (2000) and found mainstream success with the release of Good News for People Who Love Bad News (2004) and its singles "Float On" and "Ocean Breathes Salty".