1991 Estoril Open – Men's Doubles
| Men's Doubles | |
|---|---|
| 1991 Estoril Open | |
| Champions |
 Paul Haarhuis Mark Koevermans
|
| Runners-up |
Tom Nijssen Cyril Suk
|
| Final score | 6–3, 6–3 |
Sergio Casal and Emilio Sánchez were the defending champions, but lost in the semifinals this year.
Paul Haarhuis and Mark Koevermans won in the final 6–3, 6–3, against Tom Nijssen and Cyril Suk.
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