"O Baby" is a song written and recorded by English rock band Siouxsie and the Banshees.

It was produced by John Cale and released as the first single from the band's 11th studio album, The Rapture.

It is an up-tempo love song with a skipping rhythm, light guitar work and straightforward, cheerful lyrics by Siouxsie Sioux ("...the cracks in the ground grin up at me / Even the creases in my shoes smile up at me...").

The promotional video was shot in Flagstaff, Arizona at a beauty pageant with young girls: director John Hillcoat filmed it as a documentary.

The extra tracks were live acoustic versions of "Swimming Horses" and "All Tomorrow's Parties" (composed by the Velvet Underground), both recorded in December 1991 at a concert organized by radio station KROQ.