Harry G. Summers Jr. (May 6, 1932 – November 14, 1999) is best known as the author of an analysis of the Vietnam War, On Strategy: A Critical Analysis of the Vietnam War (1982). An infantry colonel in the US Army, he had served as a squad leader in the Korean War and as a battalion and corps operations officer in the Vietnam War. Summers was also an instructor and Distinguished Fellow at the Strategic Studies Institute at the US Army War College in Carlisle, Pennsylvania, and served on the negotiation team for the United States at the end of the Vietnam War.
Aside from his books, Summers wrote a syndicated national newspaper column on national security affairs for the Los Angeles Times and was the editor of Vietnam Magazine. He was also a frequent speaker at colleges, lectures, and debates.
During Operation Desert Storm, Summers served as a color commentator and analyst on the ongoing live network news broadcasts and for a time became a familiar face to the television viewers. In 1992, he wrote a book on the Gulf War, On Strategy II: A Critical Analysis of the Gulf War.