Iain Fullarton (born 25 April 1976) is a former Scottish rugby union player.
Fullarton turned professional with Edinburgh Reivers and has since played for Sale Sharks.
He won his third cap, again as a replacement for Scott Murray in the November 2001 Test, also against New Zealand.
He won his fifth cap for Scotland when he came on as a substitute in the 2003 Rugby World Cup countdown Test against Ireland in 2003.
Earlier that summer he toured South Africa with Scotland but did not play in either Test match.