James Horwill (born 29 May 1985) is an Australian former rugby union player, who has played for the Australian national side, with 61 caps to his name. He captained the Wallabies a number of times, including during the 2011 Rugby World Cup. Horwill played ten seasons in Super Rugby for the Queensland Reds, followed by four seasons with English club Harlequins. His position was second row.