Colin Edwin (born 2 July 1970) is an Australian progressive rock musician. Since December 1993 he is a member of the British band Porcupine Tree, where he plays both fretted and fretless bass guitar as well as double bass and guimbri. Edwin is also a member of Ex-Wise Heads, a long running collaboration with multi instrumentalist Geoff Leigh mixing ethnic, ambient, and post-modern influences, as well as a metal-influenced project, Random Noise Generator and the band Metallic Taste of Blood