1991 500cc Grand Prix leading entries:
| no. | rider | entrant | bike |
| 1 | Wayne Rainey USA | Marlboro Team Roberts | Yamaha |
| 19 | John Kocinski USA | Marlboro Team Roberts | Yamaha |
| 46 | Robbie Petersen USA* | Marlboro Team Roberts | Yamaha |
| 97 | Rich Oliver USA* | Marlboro Team Roberts | Yamaha |
| 9 | Kevin Magee AUS* | Team Roberts Yamaha | Yamaha |
| 4 | Niall Mackenzie SCO* | Castrol Yamaha/Team Roberts | Yamaha |
| 21 | Doug Chandler USA | Team Roberts Yamaha/Castrol | Yamaha |
| 3 | Mick Doohan AUS | Rothmans Honda | Honda |
| 5 | Wayne Gardner AUS | Rothmans Honda | Honda |
| 4 | Niall Mackenzie SCO* | Yamaha Sonauto Mobil 1 | Yamaha |
| 8 | Jean-Philippe Ruggia FRA | Yamaha Sonauto Mobil 1 | Yamaha |
| 20 | Adrien Morillas FRA | Yamaha Sonauto Mobil 1 | Yamaha |
| 6 | Juan Garriga ESP | Ducados Yamaha | Yamaha |
| 7 | Eddie Lawson USA | Cagiva | Cagiva |
| 11 | Marco Papa ITA** | Cagiva | Cagiva |
| 12 | Alex Barros BRA | Cagiva | Cagiva |
| 33 | Raymond Roche FRA** | Cagiva | Cagiva |
| 9 | Kevin Magee AUS* | Team Lucky Strike Suzuki | Suzuki |
| 27 | Didier de Radiguès BEL | Team Lucky Strike Suzuki | Suzuki |
| 34 | Kevin Schwantz USA | Team Lucky Strike Suzuki | Suzuki |
| 10 | Sito Pons ESP | Campsa Honda | Honda |
| 11 | Marco Papa ITA# | Moto Club Milano/Team Papa | Honda |
| 13 | Niggi Schmassmann SUI | Technotron | Honda |
| 15 | Ron Haslam ENG* | Norton/JPS Racing | Norton |
| 16 | Cees Doorakkers NED | HEK-Bauwmachines | Honda |
| 17 | Eddie Laycock EIR | Millar Racing | Yamaha |
| 23 | Andreas Leuthe BRD | Librenti Corse | Suzuki, Hon. |
| 24 | Helmut Schütz SUI | R.S. Rallye Sport | Honda |
| 32 | Michael Rudroff BRD# | R.S. Rallye Sport | Honda |
| 25 | Tatsuro Arata JAP* | Itohen | Yamaha |
| 28 | Shin’ichi Itoh JAP* | Pentax | Honda |
| 29 | Larry Moreno Vacondio VEN* | Domina | Domina |
| 30 | Martin Trösch BRD | MT Racing | Honda |
| 30 | Michele Valdo ITA# | Team Paton | Paton |
| 31 | Steve Spray ENG* | Roton | Roton |
| 31 | Romolo Balbi ITA# | ? | Honda |
| 33 | Sepp Doppler AUT# | Doppler Racing | Yamaha, Hon. |
| 35 | Norihiko Fujiwara JAP* | Kirin Mets | Yamaha |
| 35 | Vittorio Scatola ITA*# | Bimota Experience | Bimota, Suz. |
| 35 | Hans Becker BRD# | Romero Racing Team | Yamaha |
| 36 | Hikaru Miyagi JAP* | Ajinomoto | Honda |
| 41 | Ken’ichiro Iwahashi JAP* | Ajinomoto | Honda |
| 36 | Simon Buckmaster ENG# | Padgett’s Racing Team | Suzuki |
| 37 | Kunio Machii JAP* | Nescafé | Yamaha |
| 38 | Osamu Hiwatashi JAP* | S.R.T. | Suzuki |
| 40 | Satoshi Tsujimoto JAP* | S.R.T. | Suzuki |
| 39 | Keiji Ohishi JAP* | Camel | Yamaha |
| 44 | Tadahiko Taira JAP* | Y.R.T.R. | Yamaha |
| 45 | Toshihiko Honma JAP* | YMO | Yamaha |
| 46 | Peter Goddard AUS* | Hayashi | Yamaha |
| 50 | Vincenzo Cascino CIL* | Vogt | Vogt |
* wildcard entry at selected races
** substitute rider
# Papa also raced number 18
# Rudroff also raced numbers 35 and 39
# Valdo also raced numbers 37, 38 and 39
# Balbi also raced number 36
# Doppler also raced numbers 35, 36, 37 and 38
# Scatola also raced number 37
# Becker also raced numbers 36, 38 and 40
# Buckmaster also raced numbers 37 and 39
With grateful thanks to Phil Wain of RealRoadRacing.com
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