Snaefell Mountain Course Panorama, Isle of Man

The Mountain Course (also known as Mountain Circuit or TT Course) is a road-racing circuit located in the Isle of Man, based on public roads temporarily closed for the events. The course is used principally for the Isle of Man TT motorcycle races held in May/June, and also hosts the Manx Grand Prix and Classic TT races held in August/September of each year.

The course is also occasionally used, in whole or part, for pedal-cycle races together with linked events around other areas on the island.

The clockwise course has a lap of 37.73 miles (60.72 km), from the startline at the TT Grandstand on Glencrutchery Road (A2 Ramsey to Douglas) in the island's main town of Douglas. After negotiating urban streets, the racing circuit turns right to leave Douglas at Quarter Bridge, then proceeds along the A1 Douglas to Peel road through the villages of Braddan, Union Mills, Glen Vine, Crosby, and Greeba. The course then turns right at Ballacraine on to the A3 Castletown to Ramsey road, firstly through countryside glens followed by agricultural land interspersed by the villages of Kirk Michael, Ballaugh and Sulby, finally intersecting with the A18 Snaefell mountain road after negotiating urban streets in the town of Ramsey. The A18 then takes the course back to Douglas through the highest point, situated after the Bungalow at Hailwood's Height near the 31st Milestone and the UK Ordnance Survey spot height of 422 metres (1,385 ft) above sea level. The descent starts through countryside before entering the residential outskirts of Douglas back to the finish line.