The 1991 Mazda LPGA Championship was the 37th LPGA Championship, played June 27–30 at Bethesda Country Club in Bethesda, Maryland, a suburb northwest of Washington, D.C. Meg Mallon shot a final round 67 (−4) to win the first of her four major titles, one stroke ahead of runners-up Pat Bradley and Ayako Okamoto.

[3] All three were tied for the lead at 207 (−6) after 54 holes,[4] and played in the final grouping on Sunday.

[3] They came to the final hole tied at nine under par; all three put their drives in the fairway and had putts for birdie, but only Mallon converted.

[3] She won the U.S. Women's Open two weeks later.

This was the second of four consecutive LPGA Championships at Bethesda Country Club.