John Eisenhower, American historian, general, and diplomat, 45th United States Ambassador to Belgium (born 1922)

John Sheldon Doud Eisenhower was a United States Army officer, diplomat, and military historian. He was the second son of President Dwight D. Eisenhower and First Lady Mamie Eisenhower. His military career spanned from before, during, and after his father's presidency, and he left active duty in 1963 and then retired in 1974. From 1969 to 1971, Eisenhower served as United States Ambassador to Belgium during the administration of President Richard Nixon, who was previously his father's vice president and also father-in-law to Eisenhower's son David.

In 1832, shortly after the creation of the Kingdom of Belgium, the United States established diplomatic relations. Since that time, a long line of distinguished envoys have represented American interests in Belgium. These diplomats included men and women whose career paths would lead them to become Secretary of States, Secretary of Commerce and Chair of the Federal Trade Commission.