John Rupert Firth (June 17, 1890 in Keighley, Yorkshire – December 14, 1960 in Lindfield, West Sussex), commonly known as J. R. Firth, was an English linguist and a leading figure in British linguistics during the 1950s. He was Professor of English at the University of the Punjab from 1919–1928. He then worked in the phonetics department of University College London before moving to the School of Oriental and African Studies, where he became Professor of General Linguistics, a position he held until his retirement in 1956.
His work on prosody, which he emphasised at the expense of the phonemic principle, prefigured later work in autosegmental phonology. Firth is noted for drawing attention to the context-dependent nature of meaning with his notion of 'context of situation'. In particular, he is known for the famous quotation:
Firth developed a particular view of linguistics that has given rise to the adjective 'Firthian'. Central to this view is the idea of polysystematism. David Crystal describes this as:
His approach can be considered as resuming that of Malinowski's anthropological semantics, and as a precursor of the approach of semiotic anthropology. Anthropological approaches to semantics are alternative to the three major types of semantics approaches: linguistic semantics, logical semantics, and General semantics. Other independent approaches to semantics are philosophical semantics and psychological semantics.