| Grand Prix: | Yugoslavian |
| Flag: | Yugoslavia |
| Location: | Staza Grobink Rijeka |
| Course Mi: | 2.590 |
| Course Km: | 4.168 |
| Race No: | 13 |
| Season No: | 13 |
| Official Name: | Grand Prix de Yougoslavie |
| Date: | 17 September |
| Year: | 1978 |
| Pole Rider 350: | Gregg Hansford |
| Pole Rider 350 Country: | Australia |
| Pole Rider 350 Bike: | Kawasaki |
| Pole Time 350: | 1:39.96 |
| Fast Rider 350: | Gregg Hansford |
| Fast Rider 350 Country: | Australia |
| Fast Rider 350 Bike: | Kawasaki |
| Fast Time 350: | 1:38.0 |
| First Rider 350: | Gregg Hansford |
| First Rider 350 Country: | Australia |
| First Rider 350 Bike: | Kawasaki |
| Second Rider 350: | Franco Bonera |
| Second Rider 350 Country: | Italy |
| Second Rider 350 Bike: | Yamaha |
| Third Rider 350: | Patrick Fernandez |
| Third Rider 350 Country: | France |
| Third Rider 350 Bike: | Yamaha |
| Pole Rider 250: | Kork Ballington |
| Pole Rider 250 Country: | South Africa |
| Pole Rider 250 Country Flag Suffix: | 1928 |
| Pole Rider 250 Bike: | Kawasaki |
| Pole Time 250: | 1:42.86 |
| Fast Rider 250: | Anton Mang |
| Fast Rider 250 Country: | West Germany |
| Fast Rider 250 Bike: | Kawasaki |
| Fast Time 250: | 1:39.0 |
| First Rider 250: | Gregg Hansford |
| First Rider 250 Country: | Australia |
| First Rider 250 Bike: | Kawasaki |
| Second Rider 250: | Anton Mang |
| Second Rider 250 Country: | West Germany |
| Second Rider 250 Bike: | Kawasaki |
| Third Rider 250: | Kork Ballington |
| Third Rider 250 Country: | South Africa |
| Third Rider 250 Country Flag Suffix: | 1928 |
| Third Rider 250 Bike: | Kawasaki |
| Pole Rider 125: | Thierry Espié |
| Pole Rider 125 Country: | France |
| Pole Rider 125 Bike: | Motobécane |
| Pole Time 125: | 1:43.70 |
| Fast Rider 125: | Patrick Plisson |
| Fast Rider 125 Country: | France |
| Fast Rider 125 Bike: | Morbidelli |
| Fast Time 125: | 1:43.2 |
| First Rider 125: | Ángel Nieto |
| First Rider 125 Country: | Spain |
| First Rider 125 Country Flag Suffix: | 1977 |
| First Rider 125 Bike: | Minarelli |
| Second Rider 125: | Hans Müller |
| Second Rider 125 Country: | Switzerland |
| Second Rider 125 Bike: | Morbidelli |
| Third Rider 125: | Pierluigi Conforti |
| Third Rider 125 Country: | Italy |
| Third Rider 125 Bike: | Morbidelli |
| Pole Rider 50: | Eugenio Lazzarini |
| Pole Rider 50 Country: | Italy |
| Pole Rider 50 Bike: | Kreidler |
| Pole Time 50: | 1:54.93 |
| Fast Rider 50: | Ricardo Tormo |
| Fast Rider 50 Country: | Spain |
| Fast Rider 50 Country Flag Suffix: | 1977 |
| Fast Rider 50 Bike: | Bultaco |
| Fast Time 50: | 1:52.86 |
| First Rider 50: | Ricardo Tormo |
| First Rider 50 Country: | Spain |
| First Rider 50 Country Flag Suffix: | 1977 |
| First Rider 50 Bike: | Bultaco |
| Second Rider 50: | Eugenio Lazzarini |
| Second Rider 50 Country: | Italy |
| Second Rider 50 Bike: | Kreidler |
| Third Rider 50: | Patrick Plisson |
| Third Rider 50 Country: | France |
| Third Rider 50 Bike: | ABF |
The 1978 Yugoslavian motorcycle Grand Prix was the thirteenth and final round of the 1978 Grand Prix motorcycle racing season. It took place on 17 September 1978 at the Staza Grobnik Rijeka.
| Pos | Rider | Manufacturer | Laps | Time | Grid | Points | |
|---|---|---|---|---|---|---|---|
| 1 |  Gregg Hansford | Kawasaki | 35 | 58:21.2 | 1 | 15 | |
| 2 |  Franco Bonera | Yamaha | 35 | +7.3 | 4 | 12 | |
| 3 |  Patrick Fernandez | Yamaha | 35 | +21.2 | 2 | 10 | |
| 4 | Vic Soussan | Yamaha | 35 | +24.5 | 5 | 8 | |
| 5 |  Jon Ekerold | Yamaha | 35 | +31.8 | 11 | 6 | |
| 6 | Anton Mang | Kawasaki | 35 | +32.2 | 12 | 5 | |
| 7 | Olivier Chevallier | Yamaha | 35 | +1:40.0 | 8 | 4 | |
| 8 | Vanes Francini | Yamaha | 35 | +1:44.4 | 14 | 3 | |
| 9 | Giovanni Pellettier | Yamaha | 34 | +1 lap | 16 | 2 | |
| 10 |  Roland Freymond | Yamaha | 34 | +1 lap | 15 | 1 | |
| 11 | Mario Lega | Morbidelli | 34 | +1 lap | 10 | ||
| 12 | Giovanni Rolando | Yamaha | 34 | +1 lap | |||
| 13 | Franco Marcheggiani | Yamaha | 34 | +1 lap | |||
| 14 |  Y. Matsumoto | Yamaha | 34 | +1 lap | |||
| 15 |  Peter Sjoström | Yamaha | 33 | +2 laps | |||
| Kork Ballington | Kawasaki | 3 | |||||
 Tom Herron | Yamaha | 6 | |||||
| Hervé Moineau | Yamaha | 7 | |||||
| Pierluigi Conforti | Yamaha | 9 | |||||
| Paolo Pileri | Morbidelli | 13 | |||||
| Bruno Kneubühler | Yamaha | 17 | |||||
 Pentti Korhonen | Yamaha | 18 | |||||
| Sauro Pazzaglia | Yamaha | 19 | |||||
| Leif Gustafsson | Yamaha | 20 | |||||
| 30 starters in total | |||||||
| [1] | |||||||
| Pos | Rider | Manufacturer | Laps | Time | Grid | Points | |
|---|---|---|---|---|---|---|---|
| 1 | Gregg Hansford | Kawasaki | 29 | 49:28.98 | 2 | 15 | |
| 2 | Anton Mang | Kawasaki | 29 | +4.00 | 13 | 12 | |
| 3 | Kork Ballington | Kawasaki | 29 | +4.31 | 1 | 10 | |
| 4 | Paolo Pileri | Morbidelli | 29 | +12.91 | 4 | 8 | |
| 5 | Jon Ekerold | Yamaha | 29 | +31.68 | 6 | 6 | |
| 6 | Patrick Fernandez | Yamaha | 29 | +31.93 | 3 | 5 | |
| 7 | Mario Lega | Morbidelli | 29 | +44.34 | 5 | 4 | |
| 8 | Pentti Korhonen | Yamaha | 29 | +1:23.02 | 7 | 3 | |
| 9 | Roland Freymond | Yamaha | 29 | +1:40.90 | 18 | 2 | |
| 10 | Eero Hyvärinen | Yamaha | 29 | +1:41.16 | 12 | 1 | |
| 11 | Hans Müller | Yamaha | 29 | +1:43.85 | 15 | ||
| 12 | Giovanni Pellettier | Yamaha | 28 | +1 lap | |||
| 13 | Vanes Francini | Yamaha | 28 | +1 lap | |||
| 14 | Bernd Tüngethal | Yamaha | 28 | +1 lap | |||
| 15 | Franco Marcheggiani | Yamaha | 28 | +1 lap | |||
| 16 | Giorgio Avveduti | Yamaha | 28 | +1 lap | 19 | ||
| 17 |  Renè Delaby | Yamaha | 28 | +1 lap | |||
| 18 | Olivier Liegeois | Yamaha | 28 | +1 lap | |||
| Olivier Chevallier | Yamaha | 8 | |||||
| Vic Soussan | Yamaha | 9 | |||||
| Tom Herron | Yamaha | 10 | |||||
| Thierry Espié | Yamaha | 11 | |||||
| Sauro Pazzaglia | Yamaha | 14 | |||||
| Leif Gustafsson | Yamaha | 16 | |||||
| Hervé Moineau | Yamaha | 17 | |||||
| 30 starters in total | |||||||
| Pos | Rider | Manufacturer | Laps | Time | Grid | Points | |
|---|---|---|---|---|---|---|---|
| 1 |  Ángel Nieto | Minarelli | 25 | 44:33.3 | 2 | 15 | |
| 2 | Hans Müller | Morbidelli | 25 | +10.8 | 4 | 12 | |
| 3 | Pierluigi Conforti | Morbidelli | 25 | +11.1 | 3 | 10 | |
| 4 |  Harald Bartol | Morbidelli | 25 | +23.6 | 9 | 8 | |
| 5 | Maurizio Massimiani | Morbidelli | 25 | +41.4 | 13 | 6 | |
| 6 | Jean-Louis Guignabodet | Morbidelli | 25 | +41.7 | 10 | 5 | |
| 7 | Matti Kinnunen | Morbidelli | 25 | +45.8 | 7 | 4 | |
| 8 | Per-Edward Carlson | Morbidelli | 25 | +56.4 | 14 | 3 | |
| 9 | Patrick Plisson | Morbidelli | 25 | +57.7 | 16 | 2 | |
| 10 | Thierry Noblesse | Morbidelli | 25 | +1:04.4 | 6 | 1 | |
| 11 |  P. Herouard | Morbidelli | 25 | +1:14.0 | 11 | ||
| 12 | Stefan Dörflinger | Morbidelli | 25 | +1:24.2 | 8 | ||
| 13 | Rolf Blatter | Morbidelli | 25 | +1:50.8 | 15 | ||
| 14 | Claudio Lusuardi | Morbidelli | 24 | +1 lap | |||
| 15 |  Henk van Kessel | Condor | 24 | +1 lap | 18 | ||
| 16 | Enrico Cereda | Morbidelli | 24 | +1 lap | 20 | ||
| 17 | Maurizio Musco | Morbidelli | 24 | +1 lap | 19 | ||
| 18 | Theo Timmer | Morbidelli | 24 | +1 lap | |||
| 19 | Luigi Rinaudo | Morbidelli | 24 | +1 lap | |||
| 20 | Hagen Klein | Morbidelli | 23 | +2 laps | |||
| 21 | Boris Bajc | Morbidelli | 23 | +2 laps | |||
| Thierry Espié | Motobécane | 1 | |||||
| Eugenio Lazzarini | MBA | 5 | |||||
| August Auinger | Morbidelli | 12 | |||||
| Italo Zerbini | Morbidelli | 17 | |||||
| 30 starters in total | |||||||
| Pos | Rider | Manufacturer | Laps | Time | Grid | Points | |
|---|---|---|---|---|---|---|---|
| 1 | Ricardo Tormo | Bultaco | 20 | 38:15.02 | 2 | 15 | |
| 2 | Eugenio Lazzarini | Kreidler | 20 | +14.58 | 1 | 12 | |
| 3 | Patrick Plisson | ABF | 20 | +1:24.47 | 4 | 10 | |
| 4 | Rolf Blatter | Kreidler | 20 | +1:25.27 | 7 | 8 | |
| 5 | Ingo Emmerich | Kreidler | 20 | +1:42.95 | 6 | 6 | |
| 6 | Hagen Klein | Kreidler | 20 | +1:52.26 | 11 | 5 | |
| 7 | Wolfgang Müller | Kreidler | 20 | +1:53.48 | 5 | 4 | |
| 8 | Enrico Cereda | DRS | 19 | +1 lap | 10 | 3 | |
| 9 | Reiner Scheidhauer | Kreidler | 19 | +1 lap | 8 | 2 | |
| 10 | Aldo Pero | Kreidler | 19 | +1 lap | 9 | 1 | |
| 11 | Peter Looyenstein | Kreidler | 19 | +1 lap | 13 | ||
| 12 | Henk van Kessel | Sparta | 19 | +1 lap | 14 | ||
| 13 | Bruno di Carlo | Kreidler | 19 | +1 lap | 20 | ||
| 14 | Chris Baert | Kreidler | 19 | +1 lap | |||
| 15 | S. Zattoni | LGM | 19 | +1 lap | |||
| 16 | Ezio Mischiatti | LGM | 18 | +2 laps | |||
| 17 | Otto Machinek | Kreidler | 18 | +2 laps | |||
| Stefan Dörflinger | Kreidler | 3 | |||||
| Günter Schirnhofer | Kreidler | 12 | |||||
| Theo Timmer | Kreidler | 15 | |||||
| Claudio Lusuardi | Kreidler | 16 | |||||
| "Krstic" | Kreidler | 17 | |||||
| Hans Hummel | Kreidler | 18 | |||||
| Benjamin Laurent | FBM | 19 | |||||
| 30 starters in total | |||||||