The 2021 Big West Conference women's basketball tournament (officially known as the Air Force Reserve Big West Women's Basketball Championship due to sponsorship reasons) was the postseason women's basketball tournament for the 2020–21 season in the Big West Conference. The tournament was held March 9–13, 2021. The tournament winner received an automatic invitation to the 2021 NCAA Division I women's basketball tournament. UC Davis won the conference tournament championship game over UC Irvine, 61–42.