| 1978 GP Ouest-France | |
| Date: | 22 August 1978 |
| Stages: | 1 |
| Distance: | 202[1] |
| Unit: | km |
| Time: | 4h 54' 00" |
| First: | Pierre-Raymond Villemiane |
| First Nat: | FRA |
| Second: | Joop Zoetemelk |
| Second Nat: | NED |
| Third: | Marcel Tinazzi |
| Third Nat: | FRA |
| Previous: | 1977 |
| Next: | 1979 |
The 1978 GP Ouest-France was the 42nd edition of the GP Ouest-France cycle race and was held on 22 August 1978. The race started and finished in Plouay. The race was won by Pierre-Raymond Villemiane.
Final general classification[2]
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