1942 United States Senate elections

Colored shading indicates party with largest share of that row. } Source: == Gains, losses, and holds ==

Retirements One Republican retired instead of seeking election to finish the unexpired term and two Democrats retired instead of seeking election to a full term. Defeats Eight Democrats and one Independent sought re-election but lost in the primary or general election. One Democrat sought election to finish the unexpired term but lost in the primary election and one Democrat sought election to finish the unexpired term but lost in the general election. Post election changes ==Change in composition==

Before the elections At the beginning of 1942. Election results == Race summaries ==

Special elections during the 77th Congress In these special elections, the winner was seated during 1942 or before January 3, 1943; ordered by election date. Races leading to the 78th Congress In these regular elections, the winners were elected for the term beginning January 3, 1943; ordered by state. All of the elections involved the Class 2 seats. == Closest races ==

Eleven races had a margin of victory under 10%: There is no tipping point state == Alabama ==

There were 2 elections in Colorado. Colorado (regular) Colorado (special) == Delaware ==

| title = Senator | before_election = Henry Cabot Lodge Jr. | before_party = Republican Party (US) | after_election = Henry Cabot Lodge Jr. | after_party = Republican Party (US) }} == Michigan ==

There were two elections to the same seat due to the August 31, 1940 death of Farmer–Laborite Ernest Lundeen. Republican Joseph H. Ball was appointed October 14, 1940 to continue the term, pending the special election. Ball was elected to the next term in the regular election, but not to finish the current term in the special election. Minnesota (special) Minnesota (regular) == Mississippi ==

There were 2 elections to the same seat due to the January 12, 1941 resignation of Democrat Matthew M. Neely who was elected Governor of West Virginia. Democrat Joseph Rosier was appointed January 13, 1941 to continue the term, pending the special election. Primaries for both races were held August 4, 1942. West Virginia (special) Interim Democrat Joseph Rosier easily won the primary, but lost the special election to finish the term that would end in January 1943 to former congressman and 1936 Senate nominee Hugh Ike Shott. West Virginia (regular) Neither Shott nor Rosier were candidates in the regular election. Instead, governor (and former senator) Neely ran to reclaim his seat, having regretted leaving the Senate. Neely won the Democratic primary but lost the regular election. At the end of the term, Revercomb would lose re-election to Neely in 1948. He then won a special election to the other seat in 1956. == Wyoming ==