Kompletní výsledky závodníků GP 350 ccm roku 1978. Mistrem světa se stal Kork Ballington na motocyklu Kawasaki, druhý byl Takazumi Katayama a třetí Gregg Hansford.
Celkové pořadí jezdců GP 350 ccm 1978
| Poz. | Jméno | Číslo | Národnost | Motocykl | Body | Vítězství |
| 1 |  Kork Ballington |
5 | South Africa | Kawasaki | 134 | 6 |
| 2 |  Takazumi Katayama |
1 | Japan | Yamaha | 77 | 2 |
| 3 |  Gregg Hansford |
Australia | Kawasaki | 76 | 3 | |
| 4 | Jon Ekerold |
3 | South Africa | Yamaha | 64 | 0 |
| 5 |  Tom Herron |
2 | United Kingdom | Yamaha | 50 | 0 |
| 6 |  Michel Rougerie |
4 | France | Yamaha | 47 | 0 |
| 7 |  Franco Bonera |
Italy | Yamaha | 37 | 0 | |
| 8 | Patrick Fernandez |
8 | France | Yamaha | 36 | 0 |
| 9 | Victor Soussan |
12 | Australia | Yamaha | 34 | 0 |
| 10 | Olivier Chevallier |
6 | France | Yamaha | 27 | 0 |
| 11 |  Penti Korhonen |
Finland | Yamaha | 20 | ||
| 12 | Franco Uncini |
Italy | Yamaha | 19 | ||
| 13 | Paolo Pileri |
Italy | 18 | |||
| 14 | Mick Grant |
United Kingdom | Kawasaki | 16 | ||
| 15 | Christian Sarron |
France | Yamaha | 15 | ||
| 16 |  Anton Mang |
West Germany | Kawasaki | 14 | ||
| 17 | Patrick Pons |
France | Yamaha | 9 | ||
| 18 | Marco Lucchinelli |
Italy | Yamaha | 5 | ||
| 19 | Guy Bertin |
France | Yamaha | 5 | ||
| 20 | Eric Saul |
France | Yamaha | 4 | ||
| 21 | Vanes Francini |
Italy | Yamaha | 3 | ||
| 22 | Raymond Roche |
France | Yamaha | 3 | ||
| 23 |  Alejandro Aleman |
Venezuela | Yamaha | 2 | ||
| 24 |  Leif Gustafsson |
Sweden | Yamaha | 2 | ||
| 25 |  Peter Van Der Wal |
Netherlands | Yamaha | 2 | ||
| 26 | Gianni Pelletier |
Italy | Yamaha | 2 | ||
| 27 | A.Piccioni |
Italy | Yamaha | 1 | ||
| 28 | Eero Hyvärinen |
Finland | Yamaha | 1 | ||
| 29 | Hervi Moineau |
France | Yamaha | 1 | ||
| 30 |  Roland Freymond |
Switzerland | Yamaha | 1 | ||
| 31 | Mario Lega |
Italy | 1 |
- Zdroj: https://en.wikipedia.org
-
- 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)
