|Born|| 5 December 1956|
Wagga Wagga, New South Wales
|Position||Fullback, Wing, Centre|
|1980–83||New South Wales||4||2||0||0||3|
|As of 14 August 2011|
|Source: RLP Yesterday's Hero|
Greg Brentnall (born 5 December 1956 in Wagga Wagga, New South Wales) is an Australian former rugby league footballer of the 1970s and 80s. An Australian international and New South Wales representative fullback and winger, he played for Canterbury-Bankstown in the New South Wales Rugby League premiership, winning the 1980 grand final with them.
Brentnall played Australian rules football in Riverina in the 1960s before turning down an offer to play in the VFL/AFL and switching to rugby league, taking up a contract with the Canterbury-Bankstown Bulldogs in 1972. In 1973 he also played for Turvey Park in the Group 9 Country Rugby League competition. His ability to catch the high ball made him a valuable fullback for many rugby league representative teams, and he represented Australia.
Brentnall played on the wing for New South Wales in the inaugural 1980 State of Origin game, and later that year played in the Canterbury club's Grand Final-winning side. In 1982, he became Canterbury's first Rothmans Medal winner and also toured with that year's undefeated Kangaroos, "The Invincibles".
In 2004, Greg was named as a reserve in the Berries to Bulldogs 70 Year Team of Champions. On 1 April 2007, he was inducted into the Bulldogs Ring of Champions.
Brentnall retired from playing after the 1983 NSWRL season at the age of just 26 to take up the position of RL development officer in the Riverina for thirteen years. 
Brentnall joined the newly formed Melbourne Storm as assistant coach under former team-mate Chris Anderson. Later appointed football development manager, he continues to work there and the club have honoured him by naming the young achiever (under 18 player) trophy after him. He was also appointed chairman of the Victorian Rugby League.
- Greg Brentnall at yesterdayshero.com.au
- Greg Brentnall at the Wagga Wagga Sporting Hall of Fame
- Greg Brentnall at thebulldogs.com.au
- "Victorian Rugby League - Greg Brentnall". Australia: SportingPulse. http://www.sportingpulse.com/assoc_page.cgi?client=1-2121-0-0-0&sID=45497&&news_task=DETAIL&articleID=3871079§ionID=45497. Retrieved 2010-09-07.
- Roy Masters (2009-09-30). "Mortimer is my kind of player - I'm not sure why we let him go: Bellamy". The Sydney Morning Herald (Australia: Fairfax Media). http://www.smh.com.au/articles/2009/09/29/1253989913634.html?page=fullpage. Retrieved 2010-09-07.