| Grand Prix: | Yugoslavian |
| Flag: | Yugoslavia |
| Official Name: | Yu Grand Prix[1] [2] [3] |
| Location: | Automotodrom Rijeka |
| Course Mi: | 2.590 |
| Course Km: | 4.168 |
| Race No: | 7 |
| Season No: | 14 |
| Date: | 31 May |
| Year: | 1981 |
| Pole Rider 500: | Marco Lucchinelli |
| Pole Rider 500 Country: | ITA |
| Pole Time 500: | 1:34.100 |
| Fast Rider 500: | Marco Lucchinelli |
| Fast Rider 500 Country: | ITA |
| Fast Time 500: | 1:34.500 |
| First Rider 500: | Randy Mamola |
| First Rider 500 Country: | USA |
| Second Rider 500: | Marco Lucchinelli |
| Second Rider 500 Country: | ITA |
| Third Rider 500: | Kenny Roberts |
| Third Rider 500 Country: | USA |
| Pole Rider 350: | Anton Mang |
| Pole Rider 350 Country: | BRD |
| Fast Rider 350: | Anton Mang |
| Fast Rider 350 Country: | BRD |
| Fast Time 350: | 1:36.900 |
| First Rider 350: | Anton Mang |
| First Rider 350 Country: | BRD |
| Second Rider 350: | Jon Ekerold |
| Second Rider 350 Country: | RSA |
| Second Rider 350 Country Flag Suffix: | 1928 |
| Third Rider 350: | Carlos Lavado |
| Third Rider 350 Country: | VEN |
| Third Rider 350 Country Flag Suffix: | 1930 |
| Pole Rider 250: | No 250cc race was held |
| Fast Rider 250: | No 250cc race was held |
| First Rider 250: | No 250cc race was held |
| Second Rider 250: | No 250cc race was held |
| Third Rider 250: | No 250cc race was held |
| Pole Rider 125: | Pier Paolo Bianchi |
| Pole Rider 125 Country: | ITA |
| Pole Time 125: | 1:42.400 |
| Fast Rider 125: | Pier Paolo Bianchi |
| Fast Rider 125 Country: | ITA |
| Fast Time 125: | 1:43.000 |
| First Rider 125: | Loris Reggiani |
| First Rider 125 Country: | ITA |
| Second Rider 125: | Pier Paolo Bianchi |
| Second Rider 125 Country: | ITA |
| Third Rider 125: | Hans Müller |
| Third Rider 125 Country: | BRD |
| Pole Rider 50: | Stefan Dörflinger |
| Pole Rider 50 Country: | SUI |
| Fast Rider 50: | Ricardo Tormo |
| Fast Rider 50 Country: | ESP |
| Fast Rider 50 Country Flag Suffix: | 1977 |
| Fast Time 50: | 1:51.500 |
| First Rider 50: | Ricardo Tormo |
| First Rider 50 Country: | ESP |
| First Rider 50 Country Flag Suffix: | 1977 |
| Second Rider 50: | Stefan Dörflinger |
| Second Rider 50 Country: | SUI |
| Third Rider 50: | Rolf Blatter |
| Third Rider 50 Country: | SUI |
The 1981 Yugoslavian motorcycle Grand Prix was the seventh round of the 1981 Grand Prix motorcycle racing season. It took place on the weekend of 29–31 May 1981 at the Automotodrom Rijeka.
| Pos. | Rider | Team | Manufacturer | Time/Retired | Points | |||
|---|---|---|---|---|---|---|---|---|
| 1 |  Randy Mamola | Heron-Suzuki | Suzuki | 51'07.300 | 15 | |||
| 2 |  Marco Lucchinelli | Nava Gallina-Suzuki | Suzuki | +0.900 | 12 | |||
| 3 | Kenny Roberts | Yamaha International | Yamaha | +7.800 | 10 | |||
| 4 |  Graeme Crosby | Heron Suzuki | Suzuki | +12.700 | 8 | |||
| 5 |  Barry Sheene | Yamaha International | Yamaha | +22.500 | 6 | |||
| 6 | Gianni Pelletier | Suzuki | +1'13.500 | 5 | ||||
| 7 | Boet van Dulmen | IMN Yamaha | Yamaha | +1'25.200 | 4 | |||
| 8 |  Seppo Rossi | Suzuki | +1 lap | 3 | ||||
| 9 | Guido Paci | Yamaha | +1 lap | 2 | ||||
| 10 | Kimmo Kopra | Suzuki | +1 lap | 1 | ||||
| 11 |  Dominique Pernet | Yamaha | +1 lap | |||||
| 12 | Bernard Fau | Yamaha | +1 lap | |||||
| 13 | Alain Rothlisberger | Suzuki | +1 lap | |||||
| 14 | Willem Zoet | Stimorol Racing | Suzuki | +1 lap | ||||
| 15 | Franck Gross | Suzuki | +1 lap | |||||
| 16 | Børge Nielsen | Suzuki | +1 lap | |||||
| 17 | Josef Hage | Dieter Braun Team | Yamaha | +1 lap | ||||
| 18 |  Marco Greco | Yamaha | +1 lap | |||||
| 19 | Carlo Perugini | Moto Sanvenero | Sanvenero | +2 laps | ||||
| 20 |  Michael Schmid | Suzuki | +2 laps | |||||
| Ret | Jon Ekerold | Team Solitude Deutschland | Solo | Retired | ||||
| Ret |  Sadao Asami | Yamaha | Retired | |||||
| Ret | Philippe Coulon | Suzuki | Retired | |||||
| Ret | Virginio Ferrari | Cagiva Corse | Cagiva | Accident | ||||
| Ret | Marc Fontan | Team Sonauto Gauloises | Yamaha | Accident | ||||
| Ret | Sergio Pellandini | Suzuki | Retired | |||||
| Ret | Franco Uncini | Suzuki | Retired | |||||
| Ret | Walter Migliorati | Suzuki | Retired | |||||
| Ret | Sergio Bertocchi | Suzuki | Retired | |||||
| Ret | Christian Estrosi | Suzuki | Retired | |||||
| Ret | Graziano Rossi | Morbidelli | Morbidelli | Retired | ||||
| Ret | Gianni Rolando | Lombardini | Retired | |||||
| Ret | Mike Baldwin | Yamaha | Accident | |||||
| DNS | Kork Ballington | Team Kawasaki | Kawasaki | Did not start | ||||
| DNS | Jack Middelburg | Racing Westland | Suzuki | Did not start | ||||
| Sources:[4] [5] | ||||||||