| Number: | 20 |
| Type: | Vanier Cup |
| Date: | November 24, 1984 |
| Stadium: | Varsity Stadium |
| City: | Toronto |
| Visitor Name: | Mount Allison Mounties |
| Home Name: | Guelph Gryphons |
| Visitor Coach: | Steve Bruno |
| Home Coach: | John Musselman |
| Visitor Record: | N/A |
| Home Record: | 4–3 |
| Visitor1: | 0 |
| Visitor2: | 0 |
| Visitor3: | 0 |
| Visitor4: | 13 |
| Home1: | 0 |
| Home2: | 0 |
| Home3: | 0 |
| Home4: | 22 |
| Mvp: | Parri Ceci, Guelph |
| Attendance: | 16,321 |
The 20th Vanier Cup was played on November 24, 1984, at Varsity Stadium in Toronto, Ontario, and decided the CIAU football champion for the 1984 season. The Guelph Gryphons won their first ever championship by defeating the Mount Allison Mounties by a score of 22-13.[1] [2]