Joan Lea Bybee (Hooper; born 11 February 1945 New Orleans, LA) is an American linguist. She is a Distinguished Professor at the University of New Mexico. She served as president of the Linguistic Society of America in 2004. Much of her work concerns grammaticalisation, stochastics, modality, phonology and morphology. She was married (Austin, Texas on 19 June 1965) to William Thomas Hooper III (born 31 August 1944).
- Hooper, Joan B. 1976. An Introduction to Natural Generative Phonology. New York: Academic Press.
- Bybee, Joan L. 1985. Morphology: A Study of the Relation between Meaning and Form. Amsterdam: John Benjamins. (Korean translation by Seongha Rhee and Hyun Jung Koo. Seoul: Hankook Publishing Company, 2000.)
- Bybee, Joan, Revere Perkins and William Pagliuca. 1994. The Evolution of Grammar: Tense, Aspect and Modality in the Languages of the World. Chicago: University of Chicago Press.
- Bybee, Joan. 2001. Phonology and Language Use. Cambridge: Cambridge University Press.
- Bybee, Joan. 2005. "Language change and universals" in Linguistic Universals, edited by Ricardo Mairal and Juana Gil. Cambridge: Cambridge University Press.
- Bybee, Joan. 2006. Frequency of Use and the Organization of Language. Oxford: Oxford University Press.
- Bybee, Joan. 2010. Language, Usage and Cognition. Cambridge: Cambridge University Press.
- Bybee, Joan. 2015. Language Change. Cambridge: Cambridge University Press.
- Joan Lea Bybee: "Irrealis" as a Grammatical Category. Anthropological linguistics 40 NO. 2 (1998), pp. 257–271