| Election Name: | 1934 United States Senate special election in Montana |
| Country: | Montana |
| Flag Year: | 1905 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1930 United States Senate election in Montana |
| Previous Year: | 1930 |
| Next Election: | 1936 United States Senate election in Montana |
| Next Year: | 1936 |
| Election Date: | November 6, 1934 |
| Nominee1: | James E. Murray |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 116,965 |
| Percentage1: | 59.66% |
| Nominee2: | Scott Leavitt |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 77,307 |
| Percentage2: | 39.43% |
| Map Size: | 300px |
| U.S. Senator | |
| Before Election: | John E. Erickson |
| Before Party: | Democratic Party (United States) |
| After Election: | James E. Murray |
| After Party: | Democratic Party (United States) |
The 1934 United States Senate special election in Montana took place on November 6, 1934. Incumbent United States Senator John E. Erickson, who, as governor, had appointed himself to the seat in 1933 upon the death of Thomas J. Walsh, ran for re-election. However, he was defeated in the Democratic primary by James E. Murray, who was the former Silver Bow County Attorney and the Chairman of the State Advisory Board of the Public Works Administration. In the general election, Murray defeated Scott Leavitt, a former United States Congressman who had represented Montana's 2nd congressional district, and an independent candidate in a landslide to win his first term in the Senate.