The 1990 Mowat Cup was a series played between the winner of the British Columbia Junior Hockey League and the Peace-Cariboo Junior Hockey League to determine the British Columbia Junior A Champion and the BC seed to the Doyle Cup.
- New Westminster Royals defeated Prince George Spruce Kings 3-games-to-none
- 10/04/1990 - New Westminster 7 @ Prince George 4
- 11/04/1990 - New Westminster 8 @ Prince George 5
- 12/04/1990 - New Westminster 7 @ Prince George 4