Frederick William (F. W.) Thomas (1867-1956) was an Indologist and Tibetologist. He studied Sanskrit under the influential Orientalist Edward Byles Cowell at Cambridge. He was a librarian at the India Office Library (now subsumed into the British Library) between 1898 and 1927. Subsequently he was appointed the Boden professor of Sanskrit at Oxford University between 1927 and 1937. His students at Oxford included Harold Walter Bailey. He collaborated with Jacques Bacot in publishing a collection of Old Tibetan historical texts. In addition he studied many Old Tibetan texts himself which were collected in his four-volume Tibetan literary texts and documents concerning Chinese Turkestan and Ancient folk-literature from North-Eastern Tibet. He also published a monograph on the Nam language, and wrote an unpublished work on the Zhangzhung language. His catalogues of the Tibetan manuscripts from Central Asia brought to the India Office Library by Marc Aurel Stein remained unpublished until 2007, when his catalogue of Tibetan manuscripts from Stein's third expedition was published on the website of the International Dunhuang Project.