The 1990 Tournoi 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 V category of the 1990 WTA Tour.

It was the second edition of the tournament and was held from 24 September until 30 September 1990.

Second-seeded Nathalie Tauziat won the singles title and collected $18,000 fist-prize money.

[1] Nathalie Tauziat defeated Anke Huber 6–3, 7–6(10–8) Louise Field / Catherine Tanvier defeated Jo-Anne Faull / Rachel McQuillan 7–6(7–3), 6–7(5–7), 7–6(7–5)