Allis is a surname. Notable people with the surname include:
Conor Allis (born 1990), Irish hurler Edward P. Allis (businessman) (1824–1889), American businessman Edward Phelps Allis (zoologist) (1851–1947), American zoologist Charles David Allis (1951–2023), American molecular biologist Gilbert J. Allis (c.1879–1932), British philatelist Janine Allis (born 1965), Australian businesswoman John Allis (born 1942), American cyclist Harry Allis (1928–2006), American football player Louis Allis (1916–1994), American politician Louis Allis (golfer) (1866–1950), American golfer Mary Allis (1899–1987), American dealer of art and antiques Oswald Thompson Allis (1880–1973), American theologian and academic Thomas Allis (1788–1875), British osteologist and curator Thomas Henry Allis (1817–1870), British entomologist Victor Allis (born 1965), Dutch computer scientist William Allis (1901–1999), American physicist