2010 Wisconsin Senate election
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| 17 of 33 seats in the Wisconsin State Senate 17 seats needed for a majority | ||||||||||||||||||||||||||||||||||||||||
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| Results of the elections: Republican hold Republican gain Democratic hold No election | ||||||||||||||||||||||||||||||||||||||||
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| Elections in Wisconsin | 
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The 2010 Wisconsin Senate elections were held on Tuesday, November 2, 2010. Seventeen of the 33 seats in the Wisconsin State Senate were up for election—the odd-numbered districts. Before the election, 18 Senate seats were held by Democrats and 15 seats were held by Republicans. 10 Democratic seats and 7 Republican seats were up in this election. The primary election took place on September 14, 2010.
Republicans flipped four Democratic-held Senate seats and achieved a majority for the first time since 2004, entering the 100th Wisconsin Legislature with 19 of 33 State Senate seats.