1990 OTB International Open – Women's singles

Laura Gildemeister was the defending champion, but lost in the second round to Anke Huber.

Huber, who was 15-years old, won the title by defeating Marianne Werdel 6–1, 5–7, 6–4 in the final.

Seeds
• # 🇵🇪 Laura Gildemeister (second round)

• # 🇮🇹 Raffaella Reggi (quarterfinals, retired)

• # 🇩🇪 Claudia Porwik (withdrew)

• # Larisa Savchenko (first round)

• # 🇦🇺 Elizabeth Smylie (second round)

• # 🇦🇷 Mercedes Paz (semifinals)

• # 🇩🇪 Wiltrud Probst (semifinals)

• # Cathy Caverzasio (second round)