The 2015 Isle of Man TT was held between 30 May and 12 June 2015, on the Isle of Man TT Mountain Course.
Ian Hutchinson took 3 wins in the event, more than anyone that year.
The Senior TT was red-flagged due to the career-ending accident of Jamie Hamilton. John McGuinness won the re-started race, his 23rd, and, as of 2023, last victory at the Isle of Man TT.
The event was marred by the death of 32 year-old French rider Franck Petricola during qualifying.
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