Incumbents
- President: Abraham Lincoln (Republican/National Union)
- Vice President: Hannibal Hamlin (Republican)
- Chief Justice: Roger B. Taney
- Speaker of the House of Representatives: Galusha A. Grow (R-Pennsylvania) (until March 4), Schuyler Colfax (R-Indiana) (starting December 7)
- Congress: 37th (until March 4), 38th (starting March 4)
Read more about this topic: 1863 In The United States