Incumbents
- President: Franklin D. Roosevelt (Democratic)
- Vice President: John Nance Garner (Democratic)
- Chief Justice: Charles Evans Hughes
- Speaker of the House of Representatives: William B. Bankhead (D-Alabama) (until September 15), Sam Rayburn (D-Texas) (starting September 16)
- Senate Majority Leader: Alben W. Barkley (D-Kentucky)
- Congress: 76th
Read more about this topic: 1940 In The United States