The 1991 NAIA women's basketball tournament was the 11th annual tournament held by the NAIA to determine the national champion of women's college basketball among its members in the United States and Canada.

Fort Hays State defeated defending champions Southwestern Oklahoma State in the championship game, 57–53, to claim the Tigers' first NAIA national title.

The tournament was played at the Oman Arena in Jackson, Tennessee.

[1] The tournament field remained expanded for the second time in its history, increasing from sixteen to thirty-two teams.

The tournament continue to utilize a simple single-elimination format.