| Champ: |  Patrick Galbraith Todd Witsken |
| Runner: |  Grant Connell Glenn Michibata |
| Score: | 6–4, 3–6, 6–1 |
| Draw: | 28 (2) |
| Seeds: | 8 |
See main article: 1991 Canadian Open.
Paul Annacone and David Wheaton were the defending champions, but Wheaton chose not to participate. Annacone partnered with Doug Flach, but lost to Jim Grabb and Richey Reneberg in the first round.
Patrick Galbraith and Todd Witsken won the title, defeating Grant Connell and Glenn Michibata in the finals, 6–4, 3–6, 6–1.[1] [2]
The top four seeded teams received byes into the second round.