Kompletní výsledky závodníků GP 250 ccm roku 1978. Mistrem světa se stal Kork Ballington na motocyklu Kawasaki, druhý byl Gregg Hansford a třetí Patrick Fernandez.
Celkové pořadí jezdců GP 250 ccm 1978
| Poz. | Jméno | Číslo | Národnost | Motocykl | Body | Vítězství |
| 1 |  Kork Ballington |
6 | South Africa | Kawasaki | 124 | 4 |
| 2 |  Gregg Hansford |
Australia | Kawasaki | 118 | 4 | |
| 3 |  Patrick Fernandez |
10 | France | Yamaha | 55 | 0 |
| 4 |  Kenny Roberts |
80 | United States | Yamaha | 54 | 2 |
| 5 |  Anton Mang |
Germany | Kawasaki | 52 | 1 | |
| 6 |  Tom Herron |
5 | United Kingdom | Yamaha | 48 | 0 |
| 7 |  Mario Lega |
Italy | Morbidelli | 44 | 0 | |
| 8 | Franco Uncini |
Italy | Yamaha | 42 | 0 | |
| 9 | Jon Ekerold |
9 | South Africa | Yamaha | 40 | 0 |
| 10 | Paolo Pileri |
31 | Italy | Morbidelli | 35 | 1 |
| 11 | Raymond Roche |
France | 26 | |||
| 12 | Olivier Chevallier |
France | 25 | |||
| 13 | Jean-François Baldé |
France | 19 | |||
| 14 | Mick Grant |
United Kingdom | 17 | |||
| 15 | Victor Soussan |
Australia | 14 | |||
| 16 | Walter Villa |
Italy | 13 | |||
| 17 |  Carlos Lavado |
Venezuela | 12 | |||
| 18 | Chas Mortimer |
United Kingdom | 12 | |||
| 19 |  Penti Korhonen |
Finland | 10 | |||
| 20 | Clive Padgett |
United Kingdom | 5 | |||
| 21 |  Hans Müller |
Switzerland | 5 | |||
| 22 | Roland Freymond |
Switzerland | 4 | |||
| 23 | Ted Henter |
United States | 3 | |||
| 24 | Pekka Nurmi |
Finland | 2 | |||
| 25 | Ray Quincey |
Australia | 2 | |||
| 26 | Alejandro Aleman |
Venezuela | 2 | |||
| 27 | John Dodds |
Australia | 2 | |||
| 28 |  Leif Gustafsson |
Sweden | 1 | |||
| 29 |  Sadao Asami |
Japan | 1 | |||
| 30 | Eero Hyvärinen |
Finland | 1 | |||
| 31 | Marc Fontan |
France | 1 | |||
| 32 | Hervi Moineau |
France | 1 | |||
| 33 | Guy Bertin |
France | 1 | |||
| 34 | Thierry Espié |
France | 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)
