1991 Westchester Cup
Date	July 22–28
Edition	7th
Category	Tier V
Draw	32S / 16D
Prize money	$100,000
Location	Westchester, New York, U.S
Venue	Manhattanville College
Champions
Singles
Isabelle Demongeot
Doubles
Rosalyn Fairbank / Lise Gregory
← 1990 · Westchester Cup · 1992 →

The 1991 Westchester Cup was a women's tennis tournament played on outdoor hard courts at the Manhattanville College in Westchester, New York in the United States. It was the 7th edition of the event, the second played in Westchester, and was part of the Tier V series of the 1991 WTA Tour. The tournament was played from July 22 through July 28, 1991. Unseeded Isabelle Demongeot won the singles title and earned $18,000 first-prize money.

Finals

Singles

Isabelle Demongeot defeated Lori McNeil 6–4, 6–4

Doubles

Rosalyn Fairbank / Lise Gregory defeated Katrina Adams / Lori McNeil 7–5, 6–4