Leland B. Harrison was a United States diplomat. He held several high appointments in the foreign service, most notably as U.S. minister to Switzerland throughout World War II.

The American Commission to Negotiate Peace, successor to The Inquiry, participated in the peace negotiations at the Treaty of Versailles from January 18 to December 9, 1919. Frank Lyon Polk headed the commission in late 1919. The peace conference was superseded by the Council of Ambassadors (1920–1931), which was organized to deal with various political questions regarding the implementation of provisions of the Treaty, after the end of World War I. Members of the commission appointed by President Woodrow Wilson included: