1991 NCAA Division I softball tournament
| Teams | 20 |
|---|---|
| Finals site | |
| Champions | Arizona (1st title) |
| Runner-up | UCLA (9th WCWS Appearance) |
| Winning coach | Mike Candrea (1st title) |
The 1991 NCAA Division I softball tournament was the tenth annual tournament to determine the national champion of NCAA women's collegiate softball. Held during May 1991, twenty Division I college softball teams contested the championship. The tournament featured eight regionals of either two or three teams, each in a double elimination format. The 1991 Women's College World Series was held in Oklahoma City, Oklahoma from May 23 through May 26 and marked the conclusion of the 1991 NCAA Division I softball season. Arizona won their first championship by defeating three-time defending champions UCLA 5–1 in the final game.