| Election Name: | 1930 United States Senate election in South Dakota |
| Country: | South Dakota |
| Flag Year: | 1909 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1924 United States Senate election in South Dakota |
| Previous Year: | 1924 |
| Next Election: | 1936 United States Senate election in South Dakota |
| Next Year: | 1936 |
| Election Date: | November 4, 1930 |
| Image1: | File:Bulowwilliam.jpg |
| Nominee1: | William J. Bulow |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 106,317 |
| Percentage1: | 51.63% |
| Nominee2: | William H. McMaster |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 99,595 |
| Percentage2: | 48.37% |
| Map Size: | 240px |
| U.S. Senator | |
| Before Election: | William H. McMaster |
| Before Party: | Republican Party (United States) |
| After Election: | William J. Bulow |
| After Party: | Democratic Party (United States) |
The 1930 United States Senate election in South Dakota took place on November 4, 1930. Incumbent Republican Senator William H. McMaster ran for re-election to a second term. After beating back a challenge in the Republican primary from former State Senator George J. Danforth, McMaster faced Democratic nominee William J. Bulow, the incumbent Governor, in the general election. As the Democratic Party performed well nationwide, Bulow narrowly defeated McMaster.