The 1956 Isle of Man TT was the first round of the 1956 Grand Prix motorcycle racing season. It took place between 4 June and 8 June 1956 at the Snaefell Mountain Course for the Senior and Junior TTs and the Clypse Course for the Lightweight, Ultra Lightweight and Sidecar TTs.

Senior TT (500 cc) classification

Junior TT (350 cc) classification

Lightweight TT (250 cc) classification

Ultra Lightweight TT (125cc) classification

Sidecar TT classification

Non-championship races

Clubmans Senior TT classification

Clubmans Junior TT classification