John Francis Campbell (Iain Frangan Caimbeul, known in Scottish Gaelic as Iain Og Ile ('Young John of Islay')) (1821-1885) was a Celtic scholar. He was educated at Eton and Edinburgh. He was Secretary to the Lighthouse Commission. He was an authority on Celtic folk-lore, and published the bilingual Popular Tales of the West Highlands (4 vols., 1860-62), and various Gaelic texts. He also invented the sunshine recorder that bears his name as the Campbell-Stokes recorder.