Porcupine Tree was a British rock band formed in Hemel Hempstead, Hertfordshire, United Kingdom in 1987. During the course of the band's history, it has at times incorporated psychedelic rock, alternative, ambient, electronic, and, most recently, metal and post-rock into its unique style of progressive rock. Since 2010, mainstay Steven Wilson has concentrated on his solo work.

Porcupine Tree started out as a "fake" band, the only real member being multi-instrumentalist Steven Wilson.