David Cruz Thayne (March 10, 1971) is an American small businessman, former professional tennis player, and Democratic congressional candidate. He formerly served as chief of staff and campaign manager to Utah State Senate Minority Leader Scott Howell, a Democrat, and currently operates his own tennis-oriented small business in southern California, which has led to the production of two tennis-oriented documentaries. He was a candidate for California's 26th congressional district in 2012.