John Mathieson FRSE FRSGS (1855, Durness, Sutherland – 14 June 1945, Edinburgh) was a Scottish surveyor, cartographer, explorer and Gaelic scholar. In 1909, Mathieson retired from his post as Division Superintendent of HM Ordnance Survey in order to serve as chief surveyor on the Scottish scientific expedition to Svalbard, led by William Speirs Bruce. In 1920-21 he led the surveying party on Prins Karls Forland, largely completing Bruce's survey. In 1927 he was awarded the Gold Medal of the Royal Scottish Geographical Society and the Murchison Grant by the Royal Geographical Society.