Incumbents
- President: Richard Nixon (Republican)
- Vice President:
- until October 10: Spiro Agnew (Republican)
- October 10–December 6: vacant
- starting December 6: Gerald Ford (Republican)
- Chief Justice: Warren E. Burger
- Speaker of the House of Representatives: Carl Albert (D-Oklahoma)
- Senate Majority Leader: Mike Mansfield (D-Montana)
- Congress: 92nd (until January 3), 93rd (starting January 3)
Read more about this topic: 1973 In The United States