The 2018 NAIA Division I women's basketball tournament was the tournament held by the NAIA to determine the national champion of women's college basketball among its Division I members in the United States and Canada for the 2017–18 basketball season.

Freed–Hardeman defeated Westmont in the championship game, 76–64, to claim the Lions' first NAIA national title.

The tournament was played at the Rimrock Auto Arena at MetraPark in Billings, Montana.

[1] The tournament field remained fixed at thirty-two teams.

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