Rory Duncan (born 26 July 1977) is a former South African rugby union coach and former player.
He started his career at the , representing them in the Vodacom Cup in 1999 and 2001. He then the joined in 2002, where he played for four seasons before moving to the in 2006. Between 2008 and 2010, he had a spell at Japanese Top League club Yamaha Júbilo before returning to the for the 2010 Currie Cup season. He announced his retirement at the end of 2011.
After two seasons as head coach at Grey High School, Duncan joined the in November 2013 to become the coach of their Vodacom Cup and Under-21 sides. He is currently their Director of Rugby and Currie Cup head coach.