Bays is a surname. Notable people with the surname include:
Betty Bays (1931–1992), American baseball player Carter Bays (born 1975), American television writer Christophe Bays (born 1991), Swiss ice hockey goaltender Daniel H. Bays (1942–2019), American historian of China Eric Bays (born 1932), Canadian bishop Jan Chozen Bays (born 1945), American pediatrician and Buddhist writer Marguerite Bays (1813–1879), Swiss mystic and Roman Catholic saint Nicolas Bays (born 1977), French politician Randal Bays (born 1950), American musician Steve Bays, Canadian musician, audio engineer, and producer