Matthew Stuart Garnaut (born 7 November 1973) is a former Australian sportsman who played Australian rules football for the East Perth Football Club in the West Australian Football League (WAFL) and cricket for Western Australia.

From Perth, a number of Garnaut's family had previously played top-level sports: his grandfather, Laurie ( East Perth), father, John (East Perth), and brother, Graeme (East Perth, Peel Thunder and Subiaco) all played WAFL senior football, and his sister, Kristin, played netball for the Perth Orioles. ^[1] Garnaut played Teal Cup football for Western Australia, and later played one senior match for East Perth in the WAFL in 1994. ^[2] He later concentrated on cricket, making his first-class debut against South Australia in November 1996. ^[3] Overall, he played 16 matches for Western Australia in the 1996–97 and 1997–98 Sheffield Shield competitions, taking 37 wickets at an average of 42.00, with a best of 4/51. ^[4] Garnaut also played grade cricket for the Bayswater-Morley District Cricket Club. He was involved in a notable incident during the 1998–99 WACA First Grade final against Midland-Guildford, when he and Bret Mulder, batting tenth and eleventh respectively, put on 177 for the tenth wicket to win the tournament for Bayswater-Morley, with Garnaut finishing on 127 not out. ^{[1] [5]}

• List of Australian rules footballers and cricketers