Elections to the South Dakota Senate were held on November 6, 1934, to elect 45 candidates to the Senate to serve a two-year term in the 24th South Dakota Legislature. Democrats won thirty-two seats, a gain of two seats from the thirty they won at the 1932 general election, retaining their control of the chamber. Democratic Senator Mancel Peterson of Waubay was elected president pro tempore of the Senate.
Since the 1932 general election, Armstrong and Washabaugh counties (since merged into Stanley and Jackson, respectively) were folded into the 24th district, and Todd County was folded into the 26th district. No votes were recorded from Armstrong County.
This election took place alongside races for 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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