List of Isle of Man TT Mountain Course fatalities

This list is of fatal crashes on the Isle of Man TT Mountain Course used for the Isle of Man TT races, Manx Grand Prix and Classic TT races.

[2] For the 1911 Isle of Man TT race motor-cycle races, the event was moved from the St John's Short Course to the Four Inch Course by the UK Auto-Cycle Club, and became known as the Isle of Man TT Mountain Course, or TT Course, when used for motorcycle racing.

Victor Surridge was the first fatality on the Isle of Man TT Mountain Course, after a crash at Glen Helen during practice for the 1911 Isle of Man TT races.

This was possibly the first death in the Isle of Man in a motorcycle or road vehicle crash.

Since 1937, the only season without a fatality in either the TT or the Manx Grand Prix was in 1982.