1991 Austrian Tennis Grand Prix – Singles

Marion Maruska was the defending champion, but lost in the quarterfinals to Petra Langrová.

Manuela Maleeva-Fragnière won the title by defeating Langrová 6–4, 7–6(7–1) in the final.

Seeds
• # Manuela Maleeva-Fragnière (champion)

• # 🇦🇹 Barbara Paulus (second round)

• # 🇮🇹 Raffaella Reggi (quarterfinals)

• # Regina Rajchrtová (semifinals)

• # 🇩🇪 Claudia Kohde-Kilsch (semifinals)

• # 🇮🇹 Laura Golarsa (first round)

• # Radka Zrubáková (second round)

• # 🇫🇷 Catherine Tanvier (first round)