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
This disambiguation page lists articles about people with the same name.
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