| Tournament details | |
|---|---|
| Venue(s) | Sudbury, Ontario |
| Dates | May 1991 |
| Teams | 5 |
| Final positions | |
Champions  | Vernon Lakers (2nd title) |
Runner-up  | Sudbury Cubs |
| Tournament statistics | |
| Games played | 13 |
| Scoring leader(s) | Ryan Reynard (Thunder Bay) |
| MVP | Andrew Backen (Thunder Bay) |
The 1991 Centennial Cup was the 21st Junior "A" 1991 ice hockey National Championship for the Canadian Junior A Hockey League.
The Centennial Cup was competed for by the winners of the Doyle Cup, Anavet Cup, Central Canadian Championship, the Eastern Canadian Champion and a host city.
The tournament was hosted by the Sudbury Cubs and Sudbury, Ontario.