125 Cc Classification
| Pos | Rider | Manufacturer | Laps | Time | Grid | Points |
|---|---|---|---|---|---|---|
| 1 | Noboru Ueda | Honda | 22 | 42:23.780 | 1 | 20 |
| 2 | Fausto Gresini | Honda | 22 | +0.987 | 3 | 17 |
| 3 | Loris Capirossi | Honda | 22 | +15.199 | 11 | 15 |
| 4 | Gabriele Debbia | Aprilia | 22 | +15.440 | 10 | 13 |
| 5 | Jorge Martínez | JJ Cobas | 22 | +15.860 | 2 | 11 |
| 6 | Bruno Casanova | Honda | 22 | +23.815 | 9 | 10 |
| 7 | Ralf Waldmann | Honda | 22 | +27.403 | 5 | 9 |
| 8 | Hans Spaan | Honda | 22 | +36.338 | 13 | 8 |
| 9 | Dirk Raudies | Honda | 22 | +36.422 | 7 | |
| 10 | Manuel Herreros | JJ Cobas | 22 | +48.602 | 6 | |
| 11 | Hisashi Unemoto | Honda | 22 | +53.170 | 14 | 5 |
| 12 | Herri Torrontegui | JJ Cobas | 22 | +53.521 | 4 | |
| 13 | Adolf Stadler | JJ Cobas | 22 | +53.845 | 8 | 3 |
| 14 | Julián Miralles | JJ Cobas | 22 | +54.021 | 2 | |
| 15 | Luis Alvaro | Derbi | 22 | +54.883 | 15 | 1 |
| 16 | Alessandro Gramigni | Aprilia | 22 | +54.930 | 12 | |
| 17 | Peter Öttl | Rotax | 22 | +58.183 | ||
| 18 | Steve Patrickson | Honda | 22 | +59.052 | ||
| 19 | Arie Molenaar | Honda | 22 | +1:03.016 | ||
| 20 | Ian McConnachie | Honda | 22 | +1:04.666 | ||
| 21 | Nobuyuki Wakai | Honda | 22 | +1:05.208 | ||
| 22 | Robin Appleyard | Honda | 22 | +1:12.692 | ||
| 23 | Manuel Hernández | Honda | 22 | +1:18.821 | ||
| 24 | Alain Bronec | Honda | 22 | +1:21.511 | ||
| 25 | Javier Debon | JJ Cobas | 22 | +1:26.182 | ||
| 26 | Jos van Dongen | Honda | 22 | +1:29.294 | ||
| 27 | Peter Galvin | Honda | 21 | +1 lap | ||
| Ret | Ezio Gianola | Derbi | 20 | Retired | 4 | |
| Ret | Emilio Cuppini | Gazzaniga | 12 | Retired | ||
| Ret | Thierry Feuz | Honda | 10 | Retired | ||
| Ret | Heinz Lüthi | Honda | 6 | Retired | 7 | |
| Ret | Koji Takada | Honda | 6 | Retired | ||
| Ret | Alfred Waibel | Honda | 3 | Retired | ||
| Ret | Gimmi Bosio | Honda | 1 | Retired | 6 | |
| Ret | Kazuto Sakata | Honda | 0 | Retired | ||
| Ret | Maurizio Vitali | Gazzaniga | 0 | Retired | ||
| DNS | Serafino Foti | Honda | ||||
| DNQ | Stefan Bragger | Honda | ||||
| DNQ | Hans Koopman | Honda | ||||
| DNQ | Kinya Wada | Honda | ||||
| DNQ | Alan Patterson | Honda | ||||
| DNQ | Stefan Kurfiss | Honda | ||||
| DNQ | Hubert Abold | Honda | ||||
| DNQ | Wolfgang Fritz | Honda | ||||
| DNQ | René Dünki | Honda | ||||
| DNQ | Taru Rinne | Honda | ||||
| DNQ | Phillip Unhola | Honda | ||||
Read more about this topic: 1991 Spanish Motorcycle Grand Prix