| Election Name: | 2020 South Dakota Senate election |
| Country: | South Dakota |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2018 South Dakota Senate election |
| Previous Year: | 2018 |
| Next Election: | 2022 South Dakota Senate election |
| Next Year: | 2022 |
| Seats For Election: | All 35 seats in the South Dakota Senate |
| Majority Seats: | 18 |
| Election Date: | November 3, 2020 |
| Turnout: | 64.31%[1] |
| Leader1: | Kris Langer (retiring) |
| Party1: | Republican |
| Color1: | E81B23 |
| Leaders Seat1: | 25th district |
| Seats Before1: | 30 |
| Seats1: | 32 |
| Seat Change1: | 2 |
| Popular Vote1: | 271,017 |
| Percentage1: | 72.83% |
| Leader2: | Troy Heinert |
| Party2: | Democratic |
| Color2: | 3333FF |
| Leaders Seat2: | 26th district |
| Seats Before2: | 5 |
| Seats2: | 3 |
| Seat Change2: | 2 |
| Popular Vote2: | 78,110 |
| Percentage2: | 20.99% |
| Majority Leader | |
| Posttitle: | Majority Leader after election |
| Before Election: | Kris Langer |
| Before Party: | Republican |
| After Election: | Gary Cammack |
| After Party: | Republican |
Elections to the South Dakota Senate were held on November 3, 2020 as a part of the biennial elections in the U.S. state of South Dakota. Voters in 35 single-member constituencies elected members to the 93rd Senate. Elections were also held in the state for U.S. president, the U.S. Senate, the U.S. House, and the South Dakota House of Representatives.
Primary elections were held on June 2, 2020.[2]
The Republican Party had been in majority control of the Senate since 1995, and had not come close to losing it since then. Although the Democratic Party held some support from urban areas and districts with a large Native American population, they had been losing seats over time; the last time Democrats held a number of seats in the double digits was 2010.
| Party | Candidates | Votes | % | Seats | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Before | After | +/– | ||||||||
| Republican | 35 | 271,017 | 72.83 | 30 | 32 | 2 | ||||
| Democratic | 17 | 78,110 | 20.99 | 5 | 3 | 2 | ||||
| Libertarian | 7 | 13,938 | 3.75 | 0 | 0 | |||||
| Independent | 2 | 9,045 | 2.43 | 0 | 0 | |||||
| Total | 372,110 | 100.00 | 35 | 35 | ||||||
| Registered/Turnout | 578,655 | 64.31 | ||||||||
| Source: South Dakota Secretary of State | ||||||||||
Districts where the margin of victory was under 10%:
| align=center | District 1 • District 2 • District 3 • District 4 • District 5 • District 6 • District 7 • District 8 • District 9 • District 10 • District 11 • District 12 • District 13 • District 14 • District 15 • District 16 • District 17 • District 18 • District 19 • District 20 • District 21 • District 22 • District 23 • District 24 • District 25 • District 26 • District 27 • District 28 • District 29 • District 30 • District 31 • District 32 • District 33 • District 34 • District 35 |