William Ennis may refer to:
William J. Ennis (1862–1925), American Jesuit educator and president of Loyola University Maryland William Ennis (general, born 1841) (1841–1938), United States Army officer William P. Ennis (general, born 1878) (1878–1968), United States Army officer, son of the above William P. Ennis (general, born 1904) (1904–1989), United States Army officer, son of the above Bill Ennis-Inge (born 1973), American football coach and player