1990 Big West Conference women's basketball tournament

The 1990 Big West Conference women's basketball tournament took place March 7–10, 1990. All games were held at the Long Beach Arena in Long Beach, California. won their fourth tournament title and received the conference's automatic bid to the 1990 NCAA Women's Division I Basketball Tournament.

Format
All ten teams from the regular season standings qualified for the tournament.

The opening round featured two games, matching the eight versus nine seeds and the seven versus ten seeds. The remaining top seven teams were placed into the quarterfinal round, with teams seeded and paired based on regular-season records.

All-Tournament Team

 * Tine Freil, Pacific
 * Geannine Jordan, UNLV (MVP)
 * Pauline Jordan, UNLV
 * Angie Lee, Long Beach State
 * Penny Moore, Long Beach State
 * Julie Szukalski, Pacific