I can't remember a year when so many guns of the competition gave retired in the same year. Apologises if I miss any and add some that you think may retire. Also listed strong possibilities to retire but haven't announced it yet:
Crows:
Mark Riccuito
Lions:
Chris Scott
Chris Johnson
Michael Voss (technically retired this year)
Blues:
Kouta
Lappin
Pies:
Jimmy Clement
Paul Licuria
Possibilities: Wakelin, Bucks
Cats:
Nil
Possibility: King
Hawks:
Ben Dixon
Richie Vandenburg
Joel Smith
Freo:
Parker
Cook
Bell
Saints:
Gehrig
A Thompson
Brett Voss
M Clarke
Aaron Hamill
Swans:
Nil
Kangaroos:
Archer
Jon Hay
Kasey Green
Essendon:
Hird
Possibilities:Camporeole
Western Bulldogs:
Robbins
Darcy
Possibilities: Grant
West Coast:
Rowan Jones
Josh Wooden
Port:
Daryl Wakelin
Josh Mahoney
Richmond:
Kingsley
Knobel
R Hall
Gaspar
Dees:
N Brown
Bizzell
Pickett
Possibilities: Yze
Crows:
Mark Riccuito
Lions:
Chris Scott
Chris Johnson
Michael Voss (technically retired this year)
Blues:
Kouta
Lappin
Pies:
Jimmy Clement
Paul Licuria
Possibilities: Wakelin, Bucks
Cats:
Nil
Possibility: King
Hawks:
Ben Dixon
Richie Vandenburg
Joel Smith
Freo:
Parker
Cook
Bell
Saints:
Gehrig
A Thompson
Brett Voss
M Clarke
Aaron Hamill
Swans:
Nil
Kangaroos:
Archer
Jon Hay
Kasey Green
Essendon:
Hird
Possibilities:Camporeole
Western Bulldogs:
Robbins
Darcy
Possibilities: Grant
West Coast:
Rowan Jones
Josh Wooden
Port:
Daryl Wakelin
Josh Mahoney
Richmond:
Kingsley
Knobel
R Hall
Gaspar
Dees:
N Brown
Bizzell
Pickett
Possibilities: Yze