Guy Bernard Maddison (born 31 March 1965) is an Australian punk and grunge musician. From 1986 to 1989 he worked as a member of noise rock group Lubricated Goat and appeared on their album, Paddock of Love. He was a member of Bloodloss (1993–97), a blues-punk band, alongside Mark Arm on vocals. From 2001 Maddison is the bass guitarist of the United States-based grunge band, Mudhoney (which includes Arm), and has worked on their studio albums, Since We've Become Translucent (2002), Under a Billion Suns (2006), The Lucky Ones (2008), and Vanishing Point (2013).