Let's Get Lost is a jazz standard with music written by Jimmy McHugh and lyrics by Frank Loesser.
The song was first performed in 1943 by Mary Martin and was included in the 1943 film Happy Go Lucky. The song has since been recorded by many notable artists, including Chet Baker, Russ Morgan and His Orchestra, Johnny Nash, Vince Jones, Vaughn Monroe, Susannah McCorkle, the Ralph Sharon Quartet, Andrea Marcovicci, Dave Frishberg, and Cheryl Bentyne.