Ainslie finished the home and away games in second place.
Ainslie were defeated by top side Sydney Swans Reserves in the Second Semi-Final.
- Final score: Ainslie 9.12-66 def by Sydney Swans Reserves 11.9-75
- Goal kickers for Ainslie: B Doherty 2, J Kavanagh 2, M Barber 1, J Forsyth 1, T Lehmann 1, L Matthews 1, A McSporran 1
Ainslie played Belconnen in the Preliminary Final and were beaten by 10 points to finish in third place.
- Final score: 8.9-57 def by 10.7-67
- Goal kickers for Ainslie: Doherty 2, L Grose 1, D Jaques 1, J Kavanagh 1, T Lehmann 1, L Matthews 1, N Paine 1
The Ainslie First Grade team for the Preliminary Final was:
Brett Knowles (Capt/Coach), Matthew Barber, Ben Doherty, Joel Forsyth, Paul Grayling, Nathan Greatz, Louis Grose, Danny Jaques, Roy Jaques, James Kavanagh, Ty Lehmann, David Love, Lucas Matthews, Danial McFarlane, Peter McGrath, Dylan Nolan, Nick Paine, Todd Pulford, Ben Scolyer, Justin Searle, Ryan Tutt
Others who played First Grade in 2005 were: Shaune Austin, Aarin Butler, Gerard Cole, Liam Early, Jack Foster, Jarrod Gorman, Mitch Heaslip, Phil Henderson, Jason Kocmar, Alex McSporran, Kimball Powell, Brent Rebecca, Brett Sheehan.
James Kavanagh was the leading goal kicker in the AFL Canberra First Grade competition with 91 goals.
The Ainslie AFL Canberra representatives were Brett Knowles, James Kavanagh, Lucas Matthews, Peter McGrath, Daniel Jaques, Ben Doherty, Matthew Barber and Paul Grayling.
Brett Knowles, Lucas Matthews, Daniel Jaques, James Kavanagh and Paul Grayling were selected in the AFL Canberra Team of the Year.