"Upside Down" is a song written, co-produced, and performed by Jack Johnson for the 2006 animated film Curious George.

It is the first track and first single from the soundtrack album Sing-A-Longs and Lullabies for the Film Curious George, which was released in February 2006 (same month as theaters).

A remix edition featuring Money Mark was released as a bonus track on some versions of Sing-A-Longs and Lullabies for the Film Curious George.

The song peaked at number 38 on the Billboard Hot 100 and was Johnson's only US top-40 hit until "You and Your Heart" in 2010.

[2] The music video begins with Johnson walking along a pier carrying a guitar as Curious George watches from a tree.