Kompletní výsledky závodníků GP 250 ccm roku 1990. Mistrem světa se stal John Kocinski na motocyklu Yamaha, druhý byl Carlos Cardús a třetí Luca Cadalora.
Celkové pořadí jezdců GP 250 ccm 1990
| Poz. | Jméno | Číslo | Národnost | Tým | Motocykl | Body | Vítězství |
| 1 | 19 | United States | Marlboro-Yamaha Roberts | YZR250 | 223 | 7 | |
| 2 | 4 | Spain | Repsol-Honda | NSR250 | 208 | 4 | |
| 3 | 5 | Italy | Marlboro-Yamaha Agostini | YZR250 | 184 | 3 | |
| 4 | 9 | Germany | HB-Honda | NSR250 | 150 | 0 | |
| 5 | 14 | Netherlands | Sharp-Samson Honda | NSR250 | 127 | 1 | |
| 6 | 10 | Germany | Hein Gericke Aprilia | RS250 | 118 | 0 | |
| 7 | 6 | Japan | Ajinomoto-Honda | NSR250 | 100 | 0 | |
| 8 | 16 | Germany | HB-Honda | NSR250 | 92 | 0 | |
| 9 | 3 | Switzerland | Lucky Strike-Elf Honda | NSR250 | 86 | 0 | |
| 10 | 8 | France | Rothmans-Honda | NSR250 | 78 | 0 | |
| 11 | Spain | 76 | |||||
| 12 | Belgium | 66 | |||||
| 13 | Italy | 63 | |||||
| 14 | Germany | 52 | |||||
| 15 | Venezuela | 37 | |||||
| 16 | Alberto Puig | 32 | |||||
| 17 | Italy | 32 | |||||
| 18 | Andy Preining | 30 | |||||
| 19 | Marcellino Lucchi | 23 | |||||
| 20 | Adrien Morillas | 22 | |||||
| 21 | Renzo Colleoni | 17 | |||||
| 22 | Daryl Beattie | 13 | |||||
| 23 | Harald Eckl | 13 | |||||
| 24 | Jorge Martinez | 13 | |||||
| 25 | Toshihiko Honma | 10 | |||||
| 26 | Corrado Catalano | 10 | |||||
| 27 | Tetsuya Harada | 9 | |||||
| 28 | Andrea Borgonovo | 9 | |||||
| 29 | Nobuatsu Aoki | 8 | |||||
| 30 | Alberto Rota | 8 | |||||
| 31 | Masumitsu Taguchi | 7 | |||||
| 32 | Tsutomu Udagawa | 6 | |||||
| 33 | Niall Mackenzie | 5 | |||||
| 34 | Jean Pierre Jeandat | 4 | |||||
| 35 | Junzo Suzuki | 4 | |||||
| 36 | Bernd Kassner | 4 | |||||
| 37 | Josè Barresi | 4 | |||||
| 38 | Bernard Haenggeli | 4 | |||||
| 39 | Rich Oliver | 3 | |||||
| 40 | Alan Carter | 3 | |||||
| 41 | Trevor Manley | 2 | |||||
| 42 | Kevin Mitchell | 2 | |||||
| 43 | Urs Jücker | 2 | |||||
| 44 | Yukio Nukumi | 1 | |||||
| 45 | Ricky Rice | 1 | |||||
| 46 | Jean Foray | 1 |
- Zdroj https://en.wikipedia.org
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- kurzíva = nejrychlejší kolo závodu
- výsledek tučně = poleposition
- Ret = nedokončil závod (retired)
- NC = neklasifikován (non-classified)
- C = závod zrušen (cancelled)
- EX = vyloučen (excluded)
- DNS = nenastoupil do závodu (did not start)
- DSQ = diskvalifikován (disqualified)
- DNQ = nekvalifikoval se (did not qualified)
- DNP = nezúčastnil se (did not participate)
- WD = výsledek anulován (withdrew)