Bruce Hayes (born June 9, 1955) is a linguist. His professional position is as a professor in the Department of Linguistics at UCLA. He received his Ph.D. in 1980 from MIT, where his dissertation supervisor was Morris Halle. Hayes works in phonology, and is well known for his book Metrical Stress Theory: Principles and Case Studies, a typologically based theory of stress systems. His research interests also include phonetically based phonology and learnability. He is married to phonetician Patricia Keating.