Geoffrey William Ainsworth (27 May 1946 – 2 February 2011) was an Australian rules footballer who played with Geelong in the Victorian Football League (VFL) during the late 1960s and early 1970s. The son of a local lawyer, William Charles Ainsworth, Geoff matriculated to the University of Melbourne in 1965, where he was resident at Trinity College. He represented the college in tennis, athletics, cricket and football, and also played football with the University Blues, where he was noticed by the senior teams.