The 1938 United States Senate elections occurred in the middle of Franklin D. Roosevelt's second term. The 32 seats of Class 3 were contested in regular elections, and special elections were held to fill vacancies. The Republicans gained eight seats from the Democrats, though this occurred after multiple Democratic gains since the 1932 election, leading to the Democrats retaining a commanding lead over the Republicans with more than two-thirds of the legislative chamber. A contemporary account cited a number of reasons for the losses suffered by the Democrats. The Recession of 1937 had continued into the first half of 1938, and had arguably weakened public confidence in the administration's New Deal economic policies, along with controversy over the Judicial Procedures Reform Bill of 1937 (Roosevelt's "court-packing" plan). There were, in addition, strains between the more liberal New Deal supporters and the conservative wing of the Democratic party centered in the Southern states, which were exacerbated by an effort led by President Roosevelt to target certain conservative senators for defeat in Democratic primaries, including Walter George of Georgia, Millard Tydings of Maryland, Robert Rice Reynolds of North Carolina, and Ellison Smith of South Carolina. While a number of New Deal supporters won primary elections, such as Alben Barkley in Kentucky, who defeated Governor Happy Chandler, James P. Pope of Idaho, a prominent New Deal supporter, lost his bid for re-nomination, as did California's William McAdoo — though McAdoo's Democratic opponent, Sheridan Downey, had campaigned as a liberal New Dealer on many issues who would also do more to improve pension plans. President Franklin D. Roosevelt had faced opposition from conservative Democrats and the Republicans in Congress since the beginning of his presidency. Josiah Bailey, Edward R. Burke, Harry F. Byrd, James F. Byrnes, Walter F. George, Peter G. Gerry, Carter Glass, Pat Harrison, Rush Holt Sr., Kenneth McKellar, and Ellison D. Smith were the conservative Democratic senators that opposed Roosevelt's policies although Harrison, Burke, Byrnes, and McKellar had initially supported the First New Deal. Vice President John Nance Garner pushed for Roosevelt to support more conservative policies. The Republicans gained eight seats in the Senate while the Democrats maintained their majority. However, there were around twenty unreliable Democratic votes for Roosevelt which allowed conservatives to block some of his policies.

Gains, losses, and holds

Retirements

One Democrat retired instead of seeking re-election, one Democrat retired instead of seeking election to finish the unexpired term and one Democrat retired instead of seeking election to finish the unexpired term and election to a full term.

Defeats

Seven Democrats sought re-election but lost in the primary or general election. One Democrat sought election to a full term but lost in the primary election and one Democrat sought election to finish the unexpired term but lost in the primary election.

Death

One Democrat died on June 17, 1938, and his seat remained vacant until the election.

Post-election changes

Change in composition

Before the elections

Result of the elections

Race summaries

Special elections during the 75th Congress

In these special elections, the winner was seated during 1938 or before January 3, 1939; ordered by election date.

Races leading to the 76th Congress

In these general elections, the winners were elected for the term beginning January 3, 1939; ordered by state. All of the elections involved the Class 3 seats.

Closest races

Thirteen races had a margin of victory under 10%: There is no tipping point state.

Alabama

There were 2 elections due to the August 19, 1937, resignation of two-term Democrat Hugo Black. Democrat Dixie Bibb Graves was appointed August 20, 1937 (by her husband, the governor) to finish Black's term.

Alabama (special)

After congressman J. Lister Hill won the January 4, 1938, Democratic primary, Graves resigned and Hill was appointed to continue the term until the April 26, 1938, special election, which he won unopposed. Hill was then easily re-elected in November to the next term.

Alabama (regular)

Arizona

Incumbent Democrat Carl Hayden was re-elected to a third term, defeating Republican nominee Burt H. Clingan, chairman of the Arizona Industrial Commission, in the general election. In contrast to previous elections, Hayden was easily reelected, receiving only token opposition from a relatively unknown Republican challenger.

Arkansas

California

Colorado

Connecticut

Florida

Georgia

Idaho

Illinois

Incumbent Democrat William H. Dieterich retired, making this an open-seat.

Indiana

Iowa

Kansas

This is the last time that a Senator from Kansas lost re-election. Republicans have not lost a Senate election in the state since.

Kentucky

Louisiana

Maryland

Missouri

Nevada

New Hampshire

New Jersey (special)

New York

There were 2 elections due to the June 17, 1938, death of three-term Democrat Royal S. Copeland.

New York (regular)

New York Republicans nominated John Lord O'Brian for the U.S. Senate. Democrats re-nominated the incumbent Wagner. The American Labor Party endorsed Wagner.

New York (special)

New York Republicans nominated Edward Corsi for the short term to fill the vacancy caused by the death of Royal S. Copeland. Democrats nominated James M. Mead. The American Labor party endorsed Mead.

North Carolina

North Dakota

Ohio

Oklahoma

Oregon

There were 2 elections for the same seat, due to the January 31, 1938, resignation of two-term Republican Frederick Steiwer. Democratic businessman Alfred E. Reames was appointed February 1, 1938, to continue the term, pending a special election, but he did not run in either the special or the general elections.

Oregon (special)

Republican Alexander G. Barry was elected to finish the term, but was not a candidate for the next term.

Oregon (regular)

Pennsylvania

South Carolina

South Dakota

There were 2 elections for the same seat due to the December 20, 1936, death of three-term Republican Peter Norbeck. Democrat Herbert Hitchcock was appointed December 29, 1936, to continue the term, pending a special election.

South Dakota (special)

South Dakota (regular)

Hitchcock lost the Democratic May 3, 1938, primary for the next term to Governor of South Dakota Tom Berry.

Tennessee (special)

Utah

Vermont

Washington

Wisconsin