Road Racing World Championship Grand Prix season.
The season consisted of six Grand Prix races in five classes: 500cc, 350cc, 250cc, 125cc and Sidecars 500cc.
It began on 8 June, with Isle of Man TT and ended with Nations Grand Prix in Italy on 9 September.
Reigning 500cc champion Geoff Duke had to serve a six months ban at the start of the season for supporting a strike by privateer riders over starting money at the 1955 Dutch TT.
Bold – Pole Italics – Fastest Lap Each constructor is awarded the same number of points as their best placed rider in each race.