The 1991 Open Whirlpool - Ville de Bayonne, also known as the WTA Bayonne, was a women's tennis tournament played on indoor carpet courts in Bayonne, France, and was part of the Tier IV category of the 1991 WTA Tour.

It was the third edition of the tournament and was held from 23 September until 29 September 1991.

First-seeded Manuela Maleeva-Fragnière won the singles title and collected $27,000 fist-prize money.

[1] Manuela Maleeva-Fragnière defeated Leila Meskhi 4–6, 6–3, 6–4 Patricia Tarabini / Nathalie Tauziat defeated Rachel McQuillan / Catherine Tanvier 6–3 ret.