Östen Dahl (born 4 November 1945 in Stockholm) is a Swedish linguist and professor best known for pioneering a marker-based approach to tense and aspect in linguistic typology. Dahl finished his PhD at the University of Gothenburg and subsequently worked there as a docent before becoming professor of general linguistics at the University of Stockholm in 1980.
- Royal Swedish Academy of Sciences, member since 1997
- Royal Swedish Academy of Letters, History and Antiquities, member since 1998
- Academia Europaea, member since 2006
- honorary doctorate of philosophy from the University of Helsinki in 2003
- Tense and Aspect Systems, Oxford: Blackwell, 1985
- edited with Maria Koptjevskaja-Tamm: The Circum-Baltic Languages: Grammar and typology, Amsterdam: Benjamins, 2001
- Grammaticalization in the North: Noun phrase morphosyntax in Scandinavian vernaculars. Berlin: Language Science Press 2015. http://langsci-press.org/catalog/view/73/17/290-1 (Open Access)