250cc Grand Prix leading entries for 1991:
| no. | rider | entrant | bike |
| 2 | Carlos Cardús ESP | Repsol-Honda/Cardús | Honda NSR |
| 3 | Luca Cadalora ITA | Rothmans-Kanemoto Honda | Honda NSR |
| 4 | Helmut Bradl BRD | HB Honda Racing Team Germany | Honda NSR |
| 33 | Stefan Prein BRD | HB Honda Racing Team Germany | Honda RS |
| 5 | Wilco Zeelenberg NED | Sharp-Samson-Bieffe Team | Honda NSR |
| 21 | Leon van der Heyden NED | Sharp-Samson-Bieffe Team | Honda RS |
| 6 | Martin Wimmer BRD | Team Lucky Strike Suzuki | Suzuki RGV |
| 72 | Herri Torrontégui ESP* | Team Lucky Strike Suzuki | Suzuki |
| 7 | Masahiro Shimizu JAP | HRC Honda/Ajinomoto | Honda NSR |
| 29 | Tadayuki Okada JAP* | HRC | Honda NSR |
| 8 | Jochen Schmid BRD | Schuh-Zwafink Racing | Honda RS |
| 9 | Pier-Francesco Chili ITA | Iberna Aprilia/Valesi Racing | Aprilia |
| 27 | Renzo Colleoni ITA | Iberna Aprilia/Valesi Racing | Aprilia |
| 10 | Dominique Sarron FRA** | Team Gallina/Compagnucci | Yamaha TZ |
| 23 | Jim Filice USA* | Team Gallina | Yamaha TZ |
| 63 | Stefano Caracchi RSM# | Team Gallina | Yamaha TZ |
| 11 | Álex Crivillé ESP | Marlboro/JJ Cobas | JJ Cobas-H. |
| 13 | Loris Reggiani ITA | Aprilia Unlimited Jeans Team | Aprilia |
| 14 | Peter Lindén SVE | ? | Honda RS |
| 15 | Carlos Lavado VEN | Team Greco | Yamaha TZ |
| 16 | Alberto Puig ESP | Ducados Yamaha Puig | Yamaha YZR |
| 17 | Paolo Casoli ITA | Team Agostini/API | Yamaha TZ |
| 18 | Andy Preining AUT | ÖKM-Aprilia/SK Vöst | Aprilia |
| 19 | Marcellino Lucchi ITA | OZ Racing System | Aprilia |
| 52 | Renato Colleoni ITA# | OZ Racing System | Aprilia |
| 20 | Doriano Romboni ITA | HB Honda Racing Team Italy | Honda RS |
| 22 | Stefano Pennesse ITA | LMC Pennesse Racing | Aprilia |
| 25 | Wayne Doran RSA* | LMC Pennesse Racing | Aprilia |
| 30 | Harald Eckl BRD | JF-Aprilia-Kuhnert | Aprilia |
| 32 | Bernard Hänggeli SUI | Marlboro Aprilia Mohag | Aprilia |
| 49 | Eskil Suter SUI*# | Marlboro Aprilia Mohag | Aprilia |
| 34 | Patrick van den Goorbergh NED | Docshop/Servopax | Aprilia |
| 36 | Jean Foray FRA# | Team St Yrian Motos | Yamaha TZ |
| 39 | Alan Carter ENG* | Silkolene Honda Britain | Honda RS |
| 55 | Steve Hislop SCO*# | Silkolene Honda Britain | Honda RS |
| 41 | Frédéric Protat FRA# | FP Moto Team | Aprilia |
| 42 | Kevin Mitchell ENG# | Medd Holdings | Yamaha TZ |
| 43 | Fausto Ricci RSM# | Team Rocker by Gallina | Yamaha TZ |
| 44 | Jaime Mariano ESP# | Tecno Racing/Barrca March | Aprilia |
| 44 | Bernd Kassner BRD# | RS Rallye Sport GmbH | Aprilia |
| 45 | Corrado Catalano ITA# | Rothmans Honda Italy | Honda RS |
| 47 | Urs Jucker SUI# | Swiss Yamaha Team | Yamaha TZ |
| 48 | Ian Newton GBR# | Trans Freight Europa | Yamaha TZ |
| 51 | Jean-Pierre Jeandat FRA | Rothmans Honda France | Honda RS |
| 52 | Tetsuya Harada JAP* | Nescafé Yamaha Racing Team | Yamaha YZR |
| 53 | Masumitsu Taguchi JAP* | ? | Honda NSR |
| 54 | Tsutomu Udagawa JAP* | ? | Honda NSR |
| 55 | Nobuatsu Aoki JAP* | Cup Noodle Racing Team | Honda NSR |
| 57 | Katsuyoshi Kozono JAP*# | Jha Racing | Honda RS |
| 60 | Max Biaggi ITA*# | Team Italia | Aprilia |
| 61 | Kyoji Nanba JAP* | ? | Yamaha YZR |
| 65 | Erkka Korpiaho FIN# | AMS Mauri Racing | Aprilia |
| 72 | Herri Torrontégui ESP*# | Tecno Racing | Aprilia |
* leading wildcard rider at selected rounds
** substitute rider
# Caracchi also raced numbers 52 and 41
# Colleoni also raced numbers 45, 49 and 46
# Suter also raced numbers 53, 55 and 47
# Foray also raced numbers 54 and 37
# Hislop also raced number 57
# Protat also raced numbers 48, 36 and 69
# Mitchell also raced numbers 39, 46 and 37
# Ricci also raced numbers 49, 47 and 42
# Mariano also raced numbers 43 and 42
# Kassner also raced numbers 41, 54 and 45
# Catalano also raced numbers 41, 48, 50, 57 and 59
# Jucker also raced numbers 46, 48, 44 and 40
# Newton also raced numbers 53, 40, 50 and 38
# Kozono also raced numbers 40 and 52
# Biaggi also raced numbers 58 and 46
# Korpiaho also raced numbers 50, 38, 42, 54 and 37
# Torrentégui also raced number 56
With grateful thanks to Phil Wain of RealRoadRacing.com
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