Quintin Theodore Petroc Molesworth Riley (27 October 1905 – 25 December 1980) was a British Arctic explorer who was awarded the Polar Medal.

Quintin Riley was born in 1905 in Little Petherick, Cornwall, the youngest son of the eminent Anglo-Catholic layman, Athelstan Riley. He was educated at Lancing College, where he met Gino Watkins (1907–1932). He continued his education at Pembroke College, Cambridge, where he graduated in 1927.^[1]

In 1930–31 Riley joined the British Arctic Air Route Expedition as a meteorologist. This expedition consisted in a team of fourteen men led by Watkins with the mission to survey and monitor weather conditions in the little explored east coast of Greenland.^[2] Barely a year later Riley returned to Greenland with the smaller 1932-33 East Greenland Expedition, led by Watkins as well. He was one of the only three remaining team members following Watkin's death^[3] at Tuttilik Fjord.^[4]

Riley next joined the 1934-1937 British Graham Land Expedition led by his former Greenland teammate John Rymill. In 1938 Riley joined the Royal Naval Volunteer Reserve and became active in Norway and Iceland – among other places – during World War II. Towards the end of WW2, Riley was appointed Commanding Officer of No. 30 Commando – the brainchild of Commander Ian Fleming.^[5]

Riley died in a road accident on Christmas Day 1980 while he was living in retirement in Essex.^[6]

The Riley Glacier in Palmer Land, Antarctica, was named after him.

• Riley, Jonathan P. (1989). From pole to pole, the life of Quentin Riley 1905-1980. Bluntisham: Bluntisham Books.
• Ridgway, John (1974). Gino Watkins. Oxford University Press. ISBN 978-0-19-273136-4.
• Courtauld, Simon, The Watkins Boys, London, Michael Russell, 2010. ISBN 9780859553186.
• Scott, J.M., The Land That God Gave Cain, London, Chatto and Windus, 1933.

• Arctic exploration
• Freddie Spencer Chapman

• Essex Chronicle - Quintin relished adventuring but he found 'normal' home life difficult
• Archives - Riley, British Arctic Air Route Expedition