1990 500cc Grand Prix leading entries:
| no. | rider | entrant | bike |
| 1 | Eddie Lawson USA | Marlboro Team Roberts | Yamaha YZR |
| 2 | Wayne Rainey USA | Marlboro Team Roberts | Yamaha YZR |
| 21 | Peter Goddard AUS* | Marlboro Team Roberts | Yamaha YZR |
| 3 | Christian Sarron FRA | Gauloises Blondes Yamaha/Mobil 1 | Yamaha YZR |
| 14 | Jean-Philippe Ruggia FRA | Gauloises Blondes Yamaha/Mobil 1 | Yamaha YZR |
| 4 | Kevin Magee AUS | Team Lucky Strike Suzuki | Suzuki RGV |
| 7 | Niall Mackenzie SCO** | Team Lucky Strike Suzuki | Suzuki RGV |
| 34 | Kevin Schwantz USA | Team Lucky Strike Suzuki | Suzuki RGV |
| 40 | Satoshi Tsujimoto JAP* | Team Suzuki | Suzuki RGV |
| 5 | Pier-Francesco Chili ITA | La Cinq/ROC | Honda NSR |
| 55 | Marco Papa ITA** | La Cinq/ROC | Honda NSR |
| 55 | Carl Fogarty ENG* | La Cinq/ROC | Honda NSR |
| 6 | Sito Pons ESP | Campsa Banesto | Honda NSR |
| 8 | Ron Haslam ENG | Cagiva Corse | Cagiva C590 |
| 18 | Randy Mamola USA | Cagiva Corse | Cagiva C590 |
| 28 | Alex Barros BRA | Cagiva Corse | Cagiva C590 |
| 9 | Mick Doohan AUS | Rothmans Honda | Honda NSR |
| 10 | Wayne Gardner AUS | Rothmans Honda | Honda NSR |
| 11 | Juan Garriga ESP | Ducados Yamaha Team | Yamaha YZR |
| 15 | Norihiko Fujiwara JAP | Yamaha Motor Company Motorsports | Yamaha YZR |
| 21 | Tadahiko Taira JAP | Tech 21/Yamaha Motor Company | Yamaha YZR |
| 17 | Peter Lindén SVE | ? | Honda RS |
| 19 | Hansjörg Butz BRD | ? | Honda RS |
| 20 | Michael Rudroff BRD | RS Rallye Sport Team GmbH | Honda |
| 32 | Alois Meyer BRD# | RS Rallye Sport | Honda |
| 23 | Esko Kuparinen FIN | ? | Honda RS |
| 24 | Eddie Laycock EIR | Millar Racing | Honda RS |
| 25 | Andreas Leuthe LUX | Librenti Corse | Honda RS |
| 26 | Niggi Schmassmann SUI | FMS/N Schmassmann | Honda RS |
| 30 | Martin Trösch BRD | ? | Honda RS |
| 31 | Marco Papa ITA# | Motoclub Perugia | Honda RS |
| 33 | Karl Truchsess AUT# | Shell | Honda RS |
| 35 | Shunji Yatsushiro JAP* | Ys Racing | Honda NSR |
| 35 | Vittorio Scatola ITA# | Team Elit Paton | Paton 4V115 |
| 36 | Kunio Machii JAP* | Nescafé | Yamaha YZR |
| 37 | Hikaru Miyagi JAP* | Teera | Honda NSR |
| 38 | Osamu Hiwatashi JAP* | Schick Advantage | Suzuki RGV |
| 39 | Shin’ichi Itoh JAP* | HRC/Pentax | Honda NSR |
| 40 | Michele Valdo ITA | ? | Honda RS |
| 41 | Shinji Katayama JAP* | UCC | Yamaha YZR |
| 41 | Cees Doorakkers NED# | HRK Motors | Honda RS |
| 43 | Keiji Ohishi JAP* | Camel | Yamaha YZR |
| 43 | Rachel Nicotte FRA | ? | Chev.-Honda |
| 44 | Kenmei Matsumoto JAP* | Meikoh | Honda RS |
| ? | Romolo Balbi ITA | ? | Honda RS |
| ? | Vincenzo Cascino CIL* | ? | ? |
| ? | Greg Drew AUS* | ? | PRP |
| ? | Craig Harwood AUS* | ? | Yamaha |
| ? | Scott Mitchell AUS* | ? | Suzuki |
* selected rounds only
** substitute rider
# Meyer also raced number 42
# Papa also raced numbers 37 and 38
# Truchsess also raced numbers 35, 36 and 43
# Scatola also raced numbers 42 and 37
# Doorakkers also raced number 36
With grateful thanks to Phil Wain of RealRoadRacing.com
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