"Cactus" is a song by the American alternative rock band Pixies, and is the eighth track on their 1988 album Surfer Rosa.
It was written and sung by the band's frontman Black Francis and engineered by Steve Albini.
Between the second verse and chorus of "Cactus," the band and the studio members can be heard spelling out "Pixies."
Bass guitarist Kim Deal (then credited as 'Mrs John Murphy' in the sleeve notes of the album), later commented on the interlude: "You can hear them spelling 'Pixies' in the break, which T. Rex did in one of their songs ["The Groover"], 'T-R-E-X,' and they were copying it.
Glen Hansard and The Frames played it live in M-klub on 25 October 2001.