the 1991 u.s. women's open golf championship was the 46th edition of the u.s. women's open, held july 11–14 at colonial country club in fort worth, texas. meg mallon shot a final round 67 (−4) to finish at 283 (−1), two strokes ahead of runner-up pat bradley. mallon trailed bradley by three strokes with ten holes to play. it was the second of mallon's four major titles; she won the lpga championship two weeks earlier. mallon won her second u.s. women's open and final major thirteen years later in 2004.