Ezra Joseph Warner III (July 4, 1910 – May 30, 1974) was a historian of the American Civil War. He was born in Lake Forest, Illinois, and lived in La Jolla, California, where he worked as an investment counselor. He was the son of Ezra J. Warner, Jr. and grandson of Ezra J Warner, who were wholesale grocery business executives in Chicago, Illinois. His father, Ezra J. Warner, Jr., was president & treasurer of wholesale grocery business Sprague, Warner & Company and vice president of the Chicago Orchestral Association. His mother was the former Marion Hall. He is buried in Lake Forest Cemetery in Lake Forest. His great uncle was Union General James M. Warner.
Ezra J. Warner III is well known for his work in Civil War biography. His works included:
- Warner, Ezra J. (1959). Generals in Gray: Lives of the Confederate Commanders. Baton Rouge, LA: Louisiana State University Press. ISBN 0-8071-0823-5.
- Warner, Ezra J. (1964). Generals in Blue: Lives of the Union Commanders. Baton Rouge, LA: Louisiana State University Press. ISBN 0-8071-0822-7..
- Warner, Ezra J. (1975). Biographical Register of the Confederate Congress. Baton Rouge, LA: Louisiana State University Press. ISBN 978-0-8071-0092-9..
- 'LSU Press' Retrieved January 20, 2012.
- Bunch, Bryan H. and Alexander Hellemans. The history of science and technology: a browser's guide to the great discoveries, inventions and the people who made them from the dawn of time to today. New York, Houghton Mifflin Company, 2004. ISBN 978-0-618-22123-3. Retrieved January 20, 2012. p. 378 says that this is the same Ezra Warner who invented the first can opener in 1858. He was born in Middlebury, Vermont on March 8, 1841 and died on September 9, 1910 in Lake Forest, Illinois. He moved from Vermont first to Wisconsin in 1861 and then to Chicago about a year later. While this Ezra Warner could be the same man who invented the first can opener, the cited book is the only source which has been found that makes that specific statement.
- "Ezra Joseph Warner, Jr. b. Mar 1877 , , IL, USA d. 9 May 1933 Lake Forest, Lake, IL, USA: Arnold's and Claudia's Family Website". Ac-family.org. Retrieved 2013-06-13.