Mark Chisholm (born 18 September 1981) is a retired Australian rugby union player. Chisholm usually played as a lock, but could also cover blindside flanker. Career Chisholm represented Australia's under-19 side in 2000 as well as being named QRU Colt of the season for his club Wests Bulldogs. He also played for the under-21 side in 2001 and 2002. He spent the 2002 Super 12 season with the Queensland Reds as a product of the Energex Reds College. The following season he moved to the Brumbies and made his Super 12 debut for the side that season in a game against the Cats in Johannesburg as a replacement, he went on to play in six more matches that season. Chisholm was a pillar of the CA Brumbies' starting XV, having held down a run-on lock position for six years. The athletic 115-kilo second rower managed just seven matches for the CA Brumbies in the 2009 Super 14 season before a broken wrist, suffered against the Cheetahs in Bloemfontein, prematurely ended the veteran lock's season. While the setback saw him overlooked for the Wallabies domestic Tests, Chisholm returned to the international fold during the 2009 Tri Nations Series, again establishing himself in the Australian starting XV. His role as an incumbent lock for the Wallabies also booked him a place on the Wallabies' Grand Slam northern hemisphere tour – the fifth Spring Tour of his career. His strong lineout winning ability, aggressive physicality, barnstorming running and frequent try-scoring has formed the cornerstone of his success throughout his career. The powerful tight forward was a consistent performer for the CA Brumbies since his boom debut season in the 2004 Super 12 season that featured six tries in a Super 12 championship-winning year. In addition to his Super 12 title, Chisholm was named the CA Brumbies' 'Best Forward' and runner-up to George Smith in the Brett Robinson Award in 2007, and is currently the club's second most-capped lock behind David Giffin (80 caps). It was announced in May 2011 that Chisholm had signed with French club Bayonne on a 2-year deal. Chisholm has also been a key figure in Wallaby selections since making his Test debut – replacing Nathan Sharpe – on the 2004 Spring Tour and passed 50 Tests in 2010. The following season he made his debut for the Wallabies in a test against Scotland in Edinburgh and was subsequently named