| Grand Prix: | Dutch |
| Gp Suffix: | TT |
| Flag: | Netherlands |
| Official Name: | Dutch TT Assen[1] [2] [3] |
| Location: | TT Circuit Assen |
| Course Mi: | 3.759 |
| Course Km: | 6.049 |
| Race No: | 7 |
| Season No: | 12 |
| Date: | 29 June |
| Year: | 1985 |
| Pole Rider 500: | Freddie Spencer |
| Pole Rider 500 Country: | USA |
| Pole Time 500: | 2:13.910 |
| Fast Rider 500: | Unknown |
| First Rider 500: | Randy Mamola |
| First Rider 500 Country: | USA |
| Second Rider 500: | Ron Haslam |
| Second Rider 500 Country: | GBR |
| Third Rider 500: | Wayne Gardner |
| Third Rider 500 Country: | AUS |
| Pole Rider 250: | Unknown |
| Fast Rider 250: | Unknown |
| First Rider 250: | Freddie Spencer |
| First Rider 250 Country: | USA |
| Second Rider 250: | Martin Wimmer |
| Second Rider 250 Country: | BRD |
| Third Rider 250: | Anton Mang |
| Third Rider 250 Country: | BRD |
| Pole Rider 125: | Unknown |
| Fast Rider 125: | Unknown |
| First Rider 125: | Pier Paolo Bianchi |
| First Rider 125 Country: | ITA |
| Second Rider 125: | Ezio Gianola |
| Second Rider 125 Country: | ITA |
| Third Rider 125: | Fausto Gresini |
| Third Rider 125 Country: | ITA |
| Pole Rider 80: | Unknown |
| Fast Rider 80: | Unknown |
| First Rider 80: | Gert Kafka |
| First Rider 80 Country: | AUT |
| Second Rider 80: | Stefan Dörflinger |
| Second Rider 80 Country: | SUI |
| Third Rider 80: | Jorge Martínez |
| Third Rider 80 Country: | ESP |
The 1985 Dutch TT was the seventh round of the 1985 Grand Prix motorcycle racing season. It took place on the weekend of 27–29 June 1985 at the TT Circuit Assen located in Assen, Netherlands.
| Pos. | Rider | Team | Manufacturer | Time/Retired | Points | |||
|---|---|---|---|---|---|---|---|---|
| 1 |  Randy Mamola | Rothmans Honda Mamola | Honda | 50'47.220 | 15 | |||
| 2 |  Ron Haslam | Rothmans Honda Britain | Honda | +35.760 | 12 | |||
| 3 |  Wayne Gardner | Rothmans Honda Britain | Honda | +35.760 | 10 | |||
| 4 | Boet van Dulmen | Shell-Toshiba Racing Team | Honda | +49.410 | 8 | |||
| 5 |  Pierre-Etienne Samin | Honda Benelux Elf | Honda | +55.110 | 6 | |||
| 6 |  Didier de Radiguès | Honda Benelux Elf | Honda | +1'26.710 | 5 | |||
| 7 | Rob McElnea | Skoal Bandit Heron Suzuki | Suzuki | +2'19.720 | 4 | |||
| 8 | Mile Pajic | Stichting Netherlands Racing Team | Honda | +1 lap | 3 | |||
| 9 | Henk van der Mark | Stichting Netherlands Racing Team | Honda | +1 lap | 2 | |||
| 10 | Rob Punt | Oud Bier | Suzuki | +1 lap | 1 | |||
| 11 |  Massimo Messere | Team Italia | Honda | +1 lap | ||||
| 12 | Fabio Biliotti | Team Italia | Honda | +1 lap | ||||
| 13 | Franco Uncini | HB Suzuki GP Team | Suzuki | +1 lap | ||||
| 14 | Manfred Fischer | Honda | +1 lap | |||||
| 15 | Armando Errico | Team Italia | Honda | +1 lap | ||||
| 16 | Ray Swann | Suzuki | +1 lap | |||||
| 17 | Paul Iddon | Suzuki | +3 laps | |||||
| 18 | Marco Papa | Suzuki | +3 laps | |||||
| 19 | Maarten Duyzers | Suzuki | +3 laps | |||||
| Ret | Marco Lucchinelli | Cagiva | Retired | |||||
| Ret | Eddie Lawson | Marlboro Team Agostini | Yamaha | Accident | ||||
| Ret |  Eero Hyvärinen | Honda | Accident | |||||
| Ret | Mike Baldwin | Honda | Accident | |||||
| Ret | Christian Le Liard | Team ROC | Honda | Accident | ||||
| Ret | Raymond Roche | Marlboro Team Agostini | Yamaha | Retired | ||||
| Ret |  Karl Truchsess | Honda | Accident | |||||
| Ret | Mark Salle | Suzuki | Retired | |||||
| Ret | Thierry Espié | Chevallier | Retired | |||||
| Ret | Dave Petersen | Kreepy Krauly Racing | Honda | Retired | ||||
| Ret | Gustav Reiner | Zwafink & Wilberts Racing | Honda | Retired | ||||
| Ret |  Takazumi Katayama | Rothmans Honda Team | Honda | Retired | ||||
| Ret | Christian Sarron | Sonauto Gauloises Yamaha | Yamaha | Accident | ||||
| Ret | Steve Parrish | Yamaha | Retired | |||||
| Ret | Freddie Spencer | Rothmans Team HRC | Honda | Accident | ||||
| Ret | Wolfgang Von Muralt | Frankonia-Suzuki | Suzuki | Accident | ||||
| Ret |  Sito Pons | HB Suzuki GP Team | Suzuki | Accident | ||||
| DNQ | Dietmar Mayer | Honda | Did not qualify | |||||
| DNQ | Simon Buckmaster | Sid Griffiths Racing | Suzuki | Did not qualify | ||||
| DNQ | Peter Lemstra | Suzuki | Did not qualify | |||||
| DNQ | David Griffith | Suzuki | Did not qualify | |||||
| Sources:[4] [5] | ||||||||