William Ennis

William Ennis may refer to:


 * William Ennis (U.S. Army brigadier general) (1841–1938), United States Army officer, father of William Peirce Ennis, grandfather of William P. Ennis
 * William J. Ennis (1862–1925), American Jesuit educator and president of Loyola University Maryland
 * William Peirce Ennis (1878–1968), United States Army officer
 * William P. Ennis (1904–1989), United States Army officer, son of the above
 * Bill Ennis-Inge (born 1973), American football coach and player