1981 Mercedes Cup
| 1981 Mercedes Cup | |
|---|---|
| Date | 13–19 July |
| Edition | 4th |
| Draw | 32S / 16D |
| Prize money | $75,000 |
| Surface | Clay / outdoor |
| Location | Stuttgart, West Germany |
| Venue | Tennis Club Weissenhof |
| Champions | |
| Singles | |
 Björn Borg [1] | |
| Doubles | |
 Peter McNamara / Paul McNamee [2] | |
The 1981 Mercedes Cup, was a men's tennis tournament played on outdoor clay courts and held at the Tennis Club Weissenhof in Stuttgart, West Germany that was part of the 1981 Grand Prix circuit. It was the fourth edition of the tournament and was held from 13 July until 19 July 1981. First-seeded Björn Borg won the singles title.
Finals
Singles
Björn Borg defeated 
Ivan Lendl, 1–6, 7–6, 6–2, 6–4
- It was Borg's 2nd singles title of the year and the 63rd of his career.
Doubles
Peter McNamara / Paul McNamee defeated 
Mark Edmondson / 
Mike Estep, 2–6, 6–4, 7–6