Shaun Edward Marsh (born 9 July 1983) is an Australian cricketer who plays for the Western Warriors in Australian domestic cricket and has represented Australia at Test, One Day International and Twenty20 International levels. Nicknamed SOS ("Son of Swampy"), he is a left-handed opening batsman and very occasional spin bowler.
Marsh and his younger brother Mitchell attended Wesley College in Perth where they excelled in cricket. In 1998 Shaun set the record, which was broken ten years later, for the highest average (210) in the Public Schools Association's Darlot Cup cricket competition.
After representing Western Australia at Under 17 and Under 19 level, Marsh represented Australia at both the 1999–2000 and 2001–02 ICC Under-19 World Cups. In the 1999–2000 tournament, held in Sri Lanka, he was the second highest run scorer for Australia behind Shane Watson, and other notable teammates included played alongside Michael Clarke, Nathan Hauritz and Mitchell Johnson. At the 2001–02 tournament in New Zealand, which Australia won, he scored the fourth most runs for the tournament, with the captain of the Australian side, Cameron White being the leading run scorer.