1988 250cc Grand Prix leading entries:
| no. | rider | entrant | bike |
| 1 | Anton Mang BRD | Rothmans-Honda Germany Team | Honda NSR |
| Helmut Bradl BRD* | Team Anton Mang | Honda NSR | |
| Jochen Schmid BRD* | Team Anton Mang | Honda NSR | |
| 2 | Reinhold Roth BRD | HB-Römer Team | Honda NSR |
| 33 | Harald Eckl BRD | Römer-TM Team | Aprilia-Rotax |
| 3 | Sito Pons ESP | Campsa Honda Team | Honda NSR |
| 4 | Dominique Sarron FRA | Rothmans-Honda France | Honda NSR |
| 5 | Carlos Cardús ESP | Team Ducados Angel Nieto | Honda NSR |
| 32 | Alberto Puig ESP | Team Ducados Angel Nieto | Honda RS/NSR |
| 6 | Loris Reggiani ITA | Team Aprilia | Aprilia AF-IV |
| 7 | Luca Cadalora ITA | Marlboro Yamaha Team Agostini | Yamaha YZR |
| 8 | Martin Wimmer BRD | Team Hein Gericke | Yamaha TZ |
| 9 | Jacques Cornu SUI | Team Parisienne-Elf | Honda NSR |
| 25 | Urs Lüzi SUI | Team Parisienne-Elf | Honda RS/NSR |
| 10 | Carlos Lavado VEN | Venemotos HB Yamaha | Yamaha YZR |
| 11 | Juan Garriga ESP | Ducados Yamaha Team | Yamaha YZR |
| 12 | Masahiro Shimizu JAP | Ajinomoto-Honda/HRC | Honda NSR |
| 15 | Masaru Kobayashi JAP** | Ajinomoto-Honda/HRC | Honda NSR |
| 65 | Jim Filice USA** | HRC | Honda NSR |
| Masumitsu Taguchi JAP** | HRC | Honda NSR | |
| 14 | Manfred Herweh BRD | Yamaha TZ | |
| 16 | Jean-François Baldé FRA | Rotax-Hyères City | Défi-Rotax |
| 17 | Jean-Philippe Ruggia FRA | Team Gauloises Blondes Yamaha Mobil 1 | Yamaha TZ/YZR |
| 18 | Bruno Casanova ITA | Team Italia | Aprilia AF-IV |
| 19 | Paolo Casoli ITA | Pileri Corse | Garelli |
| 20 | Xavier Cardelus AND | Aprilia-Rotax | |
| 22 | Jochen Schmid BRD | Eckert Motorradtechnik | Honda RS |
| 24 | Donnie McLeod SCO | Team 7-Up/EMC | EMC-Rotax |
| 26 | Iván Palazzese VEN | Team Manoca | Yamaha TZ |
| 28 | Maurizio Vitali ITA | Gazzaniga Rotax | Gazzaniga-Rot’x |
| 29 | Hans Lindner AUT | Atomic Road Racing Team | Honda RS |
| 30 | August Auinger AUT | Aprilia-Rotax | |
| 31 | Jean-Michel Mattioli FRA | Racing Team Docshop/Wevamed | Yamaha TZ |
| 35 | Wilco Zeelenberg NED** | Racing Team Docshop/Wevamed | Yamaha TZ |
| 49 | René Délaby LUX | Racing Team Docshop/Wevamed | Yamaha TZ |
| 34 | Stefano Caracchi RSM | Team San Remo | Honda RS |
| 36 | Jean Foray FRA | Yamaha TZ | |
| 37 | Gary Cowan NIR# | Team Hurst/East West | Honda/Yamaha |
| 37 | Hans Becker BRD | Schuh Racing Team | Yamaha TZ |
| 41 | Kevin Mitchell ENG | D Gallacher/Bradgate Containers | Yamaha TZ |
| 44 | John Kocinski USA**# | Team Lucky Strike Roberts | Yamaha YZR/TZ |
| 44 | Guy Bertin FRA | Yamaha TZ | |
| 45 | Massimo Matteoni ITA | NMC Renzo Pasolini | Yamaha TZ |
| 47 | Urs Jücker SUI | Kung Racing Team Schweiz | Yamaha TZ |
| 52 | Wilco Zeelenberg NED** | Assmex | Yamaha TZ |
| 75 | Bubba Shobert USA** | Team MacLean Camel | Honda NSR |
| Bruno Bonhuil FRA | Honda RS | ||
| Christian Boudinot FRA | Fior-Rotax | ||
| Helmut Bradl BRD | Honda RS | ||
| Alain Bronec FRA | Yamaha/Honda | ||
| Hervé Duffard FRA | Honda RS | ||
| Toshihiko Honma JAP** | Racing Team UCC | Yamaha TZ | |
| Thierry Rapicault FRA | SNCF | Fior-Rotax | |
| Ivan Troisi VEN | Yamaha TZ |
* one-off ride
** wildcard rider at selected races only
# Cowan also raced number 43
# Kocinski also raced numbers 80 and 27
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