1989 500cc Grand Prix leading entries:
| no. | rider | entrant | bike |
| 1 | Eddie Lawson USA | Team Rothmans/Kanemoto Honda | Honda NSR |
| 2 | Wayne Gardner AUS^ | Rothmans Honda/HRC | Honda NSR |
| 17 | Roger Burnett ENG* | Rothmans Honda/HRC | Honda NSR |
| 27 | Mick Doohan AUS | Rothmans Honda/HRC | Honda NSR |
| 3 | Wayne Rainey USA | Team Lucky Strike Roberts | Yamaha YZR |
| 5 | Kevin Magee AUS | Team Lucky Strike Roberts | Yamaha YZR |
| 49 | John Kocinski USA* | Team Roberts | Yamaha YZR |
| 4 | Christian Sarron FRA | Team Gauloises Blondes Mobil 1 | Yamaha YZR |
| 6 | Niall Mackenzie SCO | Marlboro Yamaha Team Agostini | Yamaha YZR |
| 19 | Freddie Spencer USA | Marlboro Yamaha Team Agostini | Yamaha YZR |
| 53 | Luca Cadalora ITA** | Marlboro Yamaha Team Agostini | Yamaha YZR |
| Alberto Rota ITA** | Marlboro Yamaha Team Agostini | Yamaha YZR | |
| 7 | Dominique Sarron FRA | Team Elf Honda/ROC | Honda NSR |
| 55 | Adrien Morillas FRA***# | Team Elf Honda/ROC | Honda NSR |
| 8 | Ron Haslam ENG | Team Pepsi Suzuki | Suzuki RGV |
| 34 | Kevin Schwantz USA | Team Pepsi Suzuki | Suzuki RGV |
| 9 | Pier-Francesco Chili ITA | HB Honda Gallina Team | Honda NSR |
| 33 | Fred Merkel USA*# | HB Honda Gallina Team | Honda NSR |
| 10 | Rob McElnea ENG** | Cabin Racing Team | Honda NSR |
| 25 | Bubba Shobert USA | Cabin Racing Team | Honda NSR |
| 12 | Randy Mamola USA | Cagiva Corse | Cagiva C589 |
| 29 | Massimo Broccoli ITA* | Cagiva Corse | Cagiva C589 |
| 31 | Raymond Roche FRA* | Cagiva Corse | Cagiva C589 |
| 14 | Michael Rudroff BRD | HRK Motors | Honda RS |
| 54 | Cees Doorakkers NED***# | HRK Motors | Honda RS |
| 15 | Alessandro Valesi ITA | Team Iberna | Yamaha YZR |
| 16 | Marco Papa ITA | Team Greco - Paton | Paton |
| 21 | Tadahiko Taira JAP^ | Tech-21/Team Yamaha | Yamaha YZR |
| 26 | Norihiko Fujiwara JAP*/*** | Yamaha [Tech-21] | Yamaha YZR |
| 24 | Bruno Kneubühler SUI | Römer Racing Switzerland | Honda RS |
| 32 | Marco Gentile SUI | Marlboro Fior Team | Fior C89-Ym. |
| 35 | Simon Buckmaster ENG# | Racing Team Katayama | Honda RS |
| 44 | Ian Pratt GBR* | Racing Team Katayama | Honda RS |
| 54 | Fabio Biliotti ITA^ | Racing Team Katayama | Honda RS |
| 35 | Josef Doppler AUT | Honda RS | |
| 36 | Andreas Leuthe LUX# | Racing Team Librenti Corse | Libr. / Suz. |
| 40 | Fernando González ESP# | Honda RS | |
| 41 | Juan López Mella ESP# | Club Moto Cross Pozuelo | Honda RS |
| 56 | Niggi Schmassmann SUI# | Honda RS | |
| Michael Dowson AUS* | Marlboro | Yamaha YZR | |
| Shunji Yatsushiro JAP* | HRC | Honda NSR |
* wildcard entry at selected races
** replacement rider
*** substitute rider
^ did not race full season
# Morillas also raced number 56
# Merkel also raced number 84
# Doorakkers also raced number 56
# Buckmaster also raced numbers 46 and 36
# Leuthe also raced number 37
# González also raced number 33
# López Mella also raced number 30
# Schmassmann also raced number 38
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