1981 San Marino motorcycle Grand Prix

Date12 July 1981

Official nameGran Premio di San Marino^[1]

LocationAutodromo Dino Ferrari

Course

• Permanent racing facility
• 4.933 km (3.065 mi)

  1981 San Marino Grand Prix

Race details
Race 10 of 14 races in the 1981 Grand Prix motorcycle racing season
Date	12 July 1981
Official name	Gran Premio di San Marino[1]
Location	Autodromo Dino Ferrari
Course	Permanent racing facility 4.933 km (3.065 mi)
500cc
Pole position Rider Marco Lucchinelli Time 1:56.300 Fastest lap Rider Barry Sheene Time 1:57.640 Podium First Marco Lucchinelli Second Barry Sheene Third Graeme Crosby
350cc
Pole position Rider No 350cc race was held Fastest lap Rider No 350cc race was held Podium First No 350cc race was held Second No 350cc race was held Third No 350cc race was held
250cc
Pole position Rider Anton Mang Time 2:01.980 Fastest lap Rider Anton Mang Time 2:03.130 Podium First Anton Mang Second Roland Freymond Third Jean-François Baldé
125cc
Pole position Rider Loris Reggiani Time 2:09.300 Fastest lap Rider Ángel Nieto Time 2:09.320 Podium First Loris Reggiani Second Ángel Nieto Third Pier Paolo Bianchi
50cc
Pole position Rider Ricardo Tormo Time 2:23.830 Fastest lap Rider Ricardo Tormo Podium First Ricardo Tormo Second Henk van Kessel Third Theo Timmer

The 1981 San Marino motorcycle Grand Prix was the tenth race of the 1981 Grand Prix motorcycle racing season. It took place on the weekend of 10-12 July 1981 at the Autodromo Dino Ferrari.