The 1985 U.S. Women's Open was the 40th U.S. Women's Open, held July 11–14 at the Upper Course of Baltusrol Golf Club, in Springfield, New Jersey, west of New York City.

Kathy Baker, 24, won her first LPGA Tour event and only major title, three strokes ahead of runner-up Judy Clark (later Dickinson). Baker (later Guadagnino) held the lead after 54 holes at 210 (−6), one stroke ahead of Clark and 36-hole leader Nancy Lopez.

The 153-player field included 24 amateurs.

The Upper Course previously hosted the U.S. Open in 1936, won by Tony Manero. The U.S. Women's Open in 1961 was played on the more renowned Lower Course, where Mickey Wright won the third of her four titles.

Final leaderboard

Sunday, July 14, 1985

Place	Player	Score	To par	Money ($)
1	Kathy Baker	70-72-68-70=280	−8	41,975
2	Judy Clark	71-75-65-72=283	−5	21,700
3	Vicki Alvarez	72-69-71-75=287	−1	16,800
T4	Janet Coles	72-69-71-76=288	E	10,854
	Nancy Lopez	70-70-71-77=288
T6	Sally Little	73-70-74-72=289	+1	7,498
	Penny Pulz	75-74-70-70=289
T8	Jane Geddes	74-75-69-72=290	+2	5,893
	Betsy King	71-73-71-75=290
	Ayako Okamoto	72-74-73-71=290

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