The 2005 Renwick Cup decided Ontario's participant in the 2005 Allan Cup.
Qualified teams[]
- Aylmer Blues (OHA champions)
- Thunder Bay Bombers (HNO champions)
Series[]
Best-of-3
- April 8: Thunder Bay Bombers - Aylmer Blues 1:0
- April 9: Thunder Bay Bombers - Aylmer Blues 5:2
- Thunder Bay Bombers move on to the 2005 Allan Cup.