Elections to the South Dakota Senate were held on November 2, 1926, to elect 45 candidates to the Senate to serve a two-year term in the 20th South Dakota Legislature. Republicans won thirty seats, down from thirty-four at the 1924 general election, retaining their majority in the chamber. C. S. Amsden of Grant County was re-elected President pro tempore of the Senate.
This election took place alongside races for U.S. Senate, U.S. House, governor, state house, and numerous other state and local elections.
See also List of South Dakota state legislatures
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