Emmett Joseph Leahy (December 24, 1910 – June 23, 1964) was an American archivist and entrepreneur. He was a pioneer in the discipline of records management. After working in the National Archives and then during World War II in the United States Navy, he entered private business as a consultant in records management and as a records storage provider. He also participated in the two Hoover Commissions in improving the efficiency and effectiveness of government.