David Dominic Walsh (born 1961) is an Australian professional gambler who privately owns a collection of art.
Walsh grew up Roman Catholic in the Glenorchy district of Hobart, Tasmania, Australia, the youngest of three children. A high school graduate, Walsh made his fortune by developing a gambling system used to bet on horse racing and other sports.
In 2001, he founded the Moorilla Museum of Antiquities on the Berriedale peninsula in Hobart., which closed in 2007 to undergo $75 Million renovations. It was re-opened in January 2011 as the Museum of Old and New Art or MONA. MONA won the 2012 Australian Tourism Award for best new development and is a major Tasmanian tourist attraction. In July 2012, Walsh was involved in a dispute with the Australian Tax Office, which demanded he pay $37 million from the profits of his gambling system.  The dispute was "entirely resolved" in October 2012.