1864–65 United States Senate elections

← 1862 & 1863 Various dates 1866 & 1867 →
24 of the 72 seats in the United States Senate (with special elections) 25 seats needed for a majority
Majority party Minority party   Leader Henry B. Anthony[a] Party Republican Democratic Leader since March 4, 1863 Leader's seat Rhode Island Last election 32 seats 10 seats Seats before 31 10 Seats after 33 9 Seat change 2 1 Seats up 9 4 Races won 11 3   Third party Fourth party   Party Unconditional Unionist Party (US) Unionist Last election 1 seat 5 seats Seats before 5 3 Seats after 4 2 Seat change 1 1 Seats up 1 1 Races won 0 0
Results of the elections:      Democratic gain      Democratic hold      Republican gain      Republican hold      Confederacy      Barred from being seated
Majority Party before election Republican Elected Majority Party Republican

The 1864–65 United States Senate elections were held on various dates in various states. They occurred during the American Civil War and Abraham Lincoln's re-election. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1864 and 1865, and a seat may have been filled months late or remained vacant due to legislative deadlock.^[1] In these elections, terms were up for the senators in Class 2.

The Republican Party gained two seats. Most of the Southern states were absent because of the Civil War.

Results summary

Senate party division, 39th Congress (1865–1867)

• Majority party: Republican (37)
• Minority party: Democratic (9)
• Other parties: Unconditional Unionist (1); Unionist (1)
• Vacant: (24)
• Total seats: 72

Change in Senate composition

Before the elections

As a result of the elections

Beginning of the next Congress