In the sport ofAustralian rules football, thehalf-back line refers to the positions of the 3 players on the field that occupy the centre half-back and left and right half-back flank positions.

The role of the centre half-back is similar to that of a defensive midfielder in association football. As the first line of defence, the centre half-back must aim to break down opposition attacks before they can get into a scoring position.^[1] Given that a centre half-back's opponent is usually the centre half-forward, the role is regarded as akey position in the team, and is usually reserved for tall and well-built players.

As one of the team's leaders, centre half-backs must be able to read the play and have good communication skills.^[2] Although their first responsibility is to defend,^[2] the great centre half-backs have proven to be equally creative in attack as well as reliable in defence.

Notable centre half-backs from over the years include:

• Albert Chadwick (Melbourne andHawthorn, 1920–1929)^[1]
• Walter "Wacka" Scott (Norwood, 1920–1932),^[3] Magarey Medallist 1921, 1924, 1930
• Albert "Leeter" Collier (Collingwood andFitzroy, 1925–1941),^[4] Brownlow Medallist 1929
• Reg Hickey (Geelong, 1926–1940)^[4]
• Denis Cordner (Melbourne, 1943–1956)^[4]
• Ron Clegg (South Melbourne, 1949–1960),^[4] Brownlow medallist 1949
• Ian "Bluey" Shelton (Essendon, 1959–1965)^[4]
• Peter Knights (Hawthorn, 1969–1985)^[4]
• Bill Picken (Collingwood andSydney, 1974–1986)^[4]
• Jim Jess (Richmond, 1976–1988)^[4]
• Ross Glendinning (North Melbourne andWest Coast, 1978–1988),^[4] Brownlow medallist 1983
• Paul Roos (Fitzroy and Sydney, 1982–1998)^[4]
• Glen Jakovich (West Coast, 1991–2004)^[4]

The half-back flank was traditionally a defensive position, where reliability and toughness were more important than attacking flair.^[1] In the modern game, reliability and toughness must now be combined with the ability to run and carry the ball as well as take on the opposition in a counter-attacking style.^[5]

Notable half-back flankers over the years in Australian football include:

• Alec Epis (Essendon, 1958–1968)^[1]
• Barry Davis (Essendon andNorth Melbourne, 1961–1975)^[1]
• John Rantall (South Melbourne, North Melbourne andFitzroy, 1963–1980)^[1]
• Ian Bremner (Collingwood andHawthorn, 1966–1976)^[1]
• Bruce Doull (Carlton, 1969–1986),^[1] Norm Smith Medallist 1981; Named Half-back flank in AFL Team of the Century (1996)
• Stephen Wallis (Footscray, 1983–1996)^[1]
• Ken Hinkley (Fitzroy andGeelong, 1987–1995)^[1]
• Guy McKenna (West Coast, 1988–2000)^[1]
• Andrew McKay
• Rohan Smith
• Andrew McLeod
• Nigel Smart
• Luke Hodge
• Brendon Goddard
• Corey Enright
• Shannon Hurn
• Beau Waters
• Adam Saad
• Bachar Houli
• Christian Salem

• Pascoe, Robert (1995).The winter game : the complete history of Australian football. Port Melbourne: The Text Publishing Company.ISBN 0-85561-644-X.