Thomas Michael Dean (born August 24, 1963) is an American musician who is the bassist for heavy metal band Corrosion of Conformity. Dean sang on the band's early recordings from their crossover thrash era before leaving the band in 1987. In 1989, Dean, along with C.O.C. guitarist Woody Weatherman and Brian Walsby on drums, released the Snake Nation album via Caroline Records. Dean rejoined C.O.C. as the bassist and occasional vocalist in 1993 and has remained with the band since. From 2010 through 2020, the original lineup of Corrosion of Conformity consisting of Dean, Reed Mullin, and Woody Weatherman, were again performing and recording as a three-piece, until Mullin’s death in 2020.