Dennis Hayes may refer to:
Dennis Hayes (businessman) (born 1950), founder of Hayes Microcomputer Products Dennis Hayes (musician), American bass guitarist Dennis Hayes (professor) (born 1950), professor of education Dennis Courtland Hayes (born 1951), executive at the National Association for the Advancement of Colored People
See also Denis Hayes (born 1944), environmental advocate and proponent of solar power Denis A. Hayes (1860–1917), American labor union leader Dennis K. Hays (born 1953), United States Ambassador to Suriname