There were seven teams in the Canberra League in 1970, Acton, Ainslie, ANU, Eastlake, Manuka, Queanbeyan and Turner.
Ainslie finished the home and away season in second place behind the undefeated Eastlake.
Ainslie caused an upset in the Second Semi-Final defeating Eastlake at Manuka Oval.
- Final score: Ainslie 12.12-84 def Eastlake 9.23-77
- Goal kickers for Ainslie: Davies 4, G Read 3, Laffan 2, B Read 1, Johnson 1, Stubbs 1
- Best: Johnson, McCormick, Davies, G Read, Rendell
In the 1970 Grand Final before a crowd of 5000 Ainslie scraped home against Manuka to record a 6 point win. Ainslie won its first Premiership since 1961.
- Final Score
Ainslie 2.4 6.4 11.16 12.23-95
Manuka 4.1 6.6 10.6 13.11-89
- Goals: Davies 4, Gibbons 3, B Read 2, Kershaw 1, Johnson 1, Gardiner 1
- Best: Gardiner, Kershaw, Gibbons, B Read, Davies, Johnstone, Johnson
The Grand Final team was:
- Backs: Kevin Hassett, Viv Morgan, John Stubbs
- Half Backs: Geoff McCormick, Charles Smith, Bernie Ryan
- Centres: Graeme Gardiner, Ralph Rendell, Barry Kershaw
- Half Forwards: Graham Read, David Stanley, Brian Reid
- Forwards: Laurie Laffan, John Davies, Mick Gibbons
- Ruck: Peter Johnson, John Cusack, Bruce Johnstone, Tony White (19th), Peter Searle (20)
Ainslie rover Mick Gibbons finished second in the Mulrooney Medal count.
Barry Kershaw played his 150th game for Ainslie in the Second Semi-Final.
Senior Vice-President Alan Ray was awarded the Australian National Football Council Merit Award for Valuable services to Australian Football.
The Hooker Shield for the best performed club was awarded to Ainslie for the fourth time in five years.
- First Grade Captain/Coach: John Davies
- Assistant Coach: Peter Johnson