1985 250cc Grand Prix leading entries:
| no. | rider | entrant | bike |
| 2 | Manfred Herweh BRD | Massa Racing Racing Team | Real-Rotax |
| 3 | Carlos Lavado VEN | Venemotos Racing Team | Yamaha |
| 16 | Iván Palazzese VEN** | Venemotos Racing Team | Yamaha |
| 4 | Angel Nieto ESP* | Agrati Garelli | Garelli |
| 32 | Maurizio Vitali ITA | Agrati Garelli | Garelli |
| 5 | Toni Mang BRD | Marlboro Team Toni Mang | Honda RS |
| 6 | Jacques Cornu SUI | Team Parisienne-Elf | Honda / Parisienne |
| 41 | Pierre Bolle FRA# | Team Parisienne-Elf | Parisienne / Honda |
| 7 | Martin Wimmer BRD | Lui-Yamaha Racing Team | Yamaha |
| 9 | Alan Carter ENG | Donington Park | Honda RS |
| 10 | Jean-François Baldé FRA | Pernod | Pernod / Yamaha |
| 62 | Jacques Onda FRA | Pernod | Pernod / Yamaha |
| 13 | Reinhold Roth BRD | Römer Racing Team | Yamaha |
| 48 | Harald Eckl BRD# | Römer Racing Team | Yamaha |
| 61 | Karl-Thomas Grässel BRD* | Römer Racing Team | Honda |
| 14 | Jean-Michel Mattioli FRA | E.S.T. | Yamaha |
| 15 | Patrick Fernandez FRA | Promoto E.S.T. | Cobas / Scrab |
| 17 | August Auinger AUT | Monnet Racing | EBB |
| 19 | Freddie Spencer USA | Rothmans Honda/HRC | Honda NSR |
| 20 | Gary Noel ENG | Exactweld GB Ltd | Exactweld / EMC |
| 21 | Philippe Pagano FRA | Yamaha | |
| 22 | Jean-Luc Guillemet FRA | Yamaha | |
| 25 | Vincenzo Cascino CIL | Yamaha / Cobas | |
| 27 | Mario Rademeyer RSA | Team Heukerott | Yamaha |
| 29 | Joey Dunlop NIR* | Ernie Coates Racing | Honda |
| 30 | Stefano Caracchi ITA | Team Italia | Malanca / MBA |
| 35 | Fausto Ricci ITA# | Rothmans Honda Italia | Honda RS |
| 35 | Carlos Cardús ESP# | J.J. Cobas | Cobas-Rotax |
| 40 | Juan Garriga ESP# | J.J. Cobas | Cobas-Rotax |
| 36 | Stéphane Mertens BEL# | Team Yamaha Total | Yamaha |
| 39 | Donnie McLeod SCO# | Silverstone Armstrong GP Team | Armstrong-Rotax |
| 62 | Niall Mackenzie SCO# | Silverstone Armstrong GP Team | Armstrong-Rotax |
| 39 | Luis M Reyes COL | Cobas | |
| 40 | Jean Foray FRA# | Chevallier / Yam. | |
| 41 | Loris Reggiani ITA | Aprilia Racing Team | Aprilia-Rotax |
| 43 | Roland Freymond SUI# | Höstettler/Yamaha | Yamaha |
| 43 | Hans Lindner AUT** | Rotax | |
| 47 | Siegfried Minich AUT# | RS Rallye Sport | Yamaha |
| 48 | Geoff Fowler GBR | Antonio Gutierrez | Arbizu-Rotax |
| 49 | Jean-Louis Guignabodet FRA# | M.I.G. | MIG-Rotax |
| 50 | Andy Watts ENG | Ehrlich Automotive Ltd. | EMC-Rotax |
| 51 | Hans Becker BRD | Dieter Braun PVM Team | Yamaha |
| 53 | Antonio Garcia Moreno ESP | Kobas | |
| 54 | Michel Galbit FRA | Yamaha / KYF | |
| 55 | Thierry Rapicault FRA# | Segura | Yamaha |
| 55 | Edwin Weibel SUI | Yamaha / Rotax | |
| 67 | Dominique Sarron FRA# | Rothmans Honda France | Honda RS |
| 70 | Patrick Igoa FRA* | Rothmans Honda France | Honda RS |
| 69 | René Délaby BEL | Morena / Rotax | |
| 72 | Antonio Neto BRA# | Yamaha / Kobas |
* selected races only
** did not race full season
# Bolle also raced number 44
# Eckl also raced number 44
# Ricci also raced numbers 33 and 37
# Cardús also raced number 33
# Garriga also raced numbers 46 and 45
# Mertens also raced number 34
# McLeod also raced numbers 36 and 53
# Mackenzie also raced numbers 67, 49 and 59
# Foray also raced number 46
# Freymond also raced number 42
# Minich also raced numbers 1 and 40
# Guignabodet also raced number 38
# Rapicault also raced numbers 42 and 47
# Sarron also raced numbers 63 and 60
# Neto also raced number 67
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