1981 Nations motorcycle Grand Prix

  1981 Nations Grand Prix

Race details
Race 4 of 12 races in the 1981 Grand Prix motorcycle racing season
Date	10 May 1981
Official name	Gran Premio delle Nazioni[1]
Location	Autodromo Nazionale Monza
Course	Permanent racing facility 5.800 km (3.604 mi)
500cc
Pole position Rider Marco Lucchinelli Time 1:53.960 Fastest lap Rider Marco Lucchinelli Time 2:06.900 Podium First Kenny Roberts Second Graeme Crosby Third Barry Sheene
350cc
Pole position Rider Anton Mang Fastest lap Rider Jon Ekerold Podium First Jon Ekerold Second Anton Mang Third Massimo Matteoni
250cc
Pole position Rider Anton Mang Time 2:01.520 Fastest lap Rider Anton Mang Time 2:13.810 Podium First Éric Saul Second Maurizio Massimiani Third Anton Mang
125cc
Pole position Rider Pier Paolo Bianchi Fastest lap Rider Guy Bertin Time 2:22.810 Podium First Guy Bertin Second Loris Reggiani Third Jacques Bolle
50cc
Pole position Rider Stefan Dörflinger Fastest lap Rider Ricardo Tormo Podium First Ricardo Tormo Second Stefan Dörflinger Third Hagen Klein

The 1981 Nations motorcycle Grand Prix was the fourth race of the 1981 Grand Prix motorcycle racing season. It took place on the weekend of 8–10 May 1981 at the Autodromo Nazionale Monza.