The 1981 Porsche Tennis Grand Prix was a women's singles tennis tournament played on indoor carpet courts at the Tennis Sporthalle Filderstadt in Filderstadt in West Germany.

The event was part of the Category 4[a] tier of the 1981 Toyota Series.

It was the fourth edition of the tournament and was held from 26 October through 1 November 1981.

[2] First-seeded Tracy Austin won the singles event, her fourth successive singles title at the event, and the accompanying $22,000 first-prize money.

[2][1] Tracy Austin defeated Martina Navratilova 4–6, 6–3, 6–4 Mima Jaušovec / Martina Navratilova defeated Barbara Potter / Anne Smith 6–4, 6–1