1978 Nations motorcycle Grand Prix

  1978 Nations Grand Prix
Race details
Race 5 of 13 races in the
1978 Grand Prix motorcycle racing season
Date14 May 1978
Official nameGran Premio delle Nazioni
LocationAutodromo Internazionale del Mugello
Course
  • Permanent racing facility
  • 5.245 km (3.259 mi)
500cc
Pole position
Rider Kenny Roberts
Time 2:05.600
Fastest lap
Rider Kenny Roberts
Time 2:04.800
Podium
First Kenny Roberts
Second Pat Hennen
Third Marco Lucchinelli
350cc
Pole position
Rider Franco Uncini
Time 2:10.590
Fastest lap
Rider Gregg Hansford
Time 2:07.600
Podium
First Kork Ballington
Second Gregg Hansford
Third Takazumi Katayama
250cc
Pole position
Rider Kenny Roberts
Time 2:11.360
Fastest lap
Rider Kork Ballington
Time 2:09.300
Podium
First Kork Ballington
Second Gregg Hansford
Third Franco Uncini
125cc
Pole position
Rider Eugenio Lazzarini
Time 2:16.850
Fastest lap
Rider Thierry Espié
Time 2:15.100
Podium
First Eugenio Lazzarini
Second Maurizio Massimiani
Third Harald Bartol
50cc
Pole position
Rider Ricardo Tormo
Time 2:30.330
Fastest lap
Rider Stefan Dörflinger
Time 2:28.000
Podium
First Ricardo Tormo
Second Patrick Plisson
Third Julien van Zeebroeck
Sidecar (B2A)
Pole position
Rider Alain Michel
Time 2:13.490
Fastest lap
Rider Rolf Biland
Time 2:14.700
Podium
First Rolf Biland
Second Werner Schwärzel
Third Jean-François Monnin

The 1978 Nations motorcycle Grand Prix was the fifth round of the 1978 Grand Prix motorcycle racing season. It took place on the weekend of 12–14 May 1978 at the Autodromo Internazionale del Mugello.