Stewart Ginn (born 2 June 1949) is an Australian professional golfer.

Ginn was born in Melbourne. He grew up behind the twelfth green of the Royal Melbourne Golf Club and started caddying at the age of ten. In the 1970s and 1980s he won several professional tournaments on the PGA Tour of Australasia and one on the European Tour, the 1974 Martini International. He also played regularly on the Japan Golf Tour, where he has one win. He won the inaugural PGA Tour of Australia Order of Merit in 1973.

As a senior, he played full-time on the U.S.-based Champions Tour from 2000 to 2004. His one official money win at that level came at one of the senior majors, the 2002 Senior Players Championship.