Gary Nilsson (born 28 November 1963 in Brisbane, Australia) is a former Australian baseball player who played as a pitcher for the Lakeland Tigers in 1984 and in the Australian Baseball League from 1989 to 1996. He is the brother of former All-Star, Dave Nilsson as well as former minor leaguer Bob Nilsson. His son is Mitch Nilsson, currently contracted to the Cleveland Indians and nephew Jay Nilsson, former Gulf Coast Indians player. He is currently pitching coach for the Brisbane Bandits in the Australian Baseball League.