"Octopus" is a song by Syd Barrett. In January 1970 it appeared on his first solo album The Madcap Laughs.

Roger Keith "Syd" Barrett was an English singer, guitarist and songwriter who co-founded the rock band Pink Floyd in 1965. Barrett was the band's original frontman and primary songwriter, known for his whimsical style of psychedelia, English-accented singing, and stream-of-consciousness writing style. As a guitarist, he was influential for his free-form playing and for employing effects such as dissonance, distortion, echo and feedback.