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.
- James E. Murray, Chairman of the State Advisory Board of the Public Works Administration, former Silver Bow County Attorney
- James F. O'Connor, former Speaker of the Montana House of Representatives
- John E. Erickson, incumbent United States Senator
- Louis P. Donovan
- John A. Lovelace
- W. W. Hamilton
|Democratic||James E. Murray||19,640||24.89%|
|Democratic||James F. O'Connor||18,194||23.05%|
|Democratic||John E. Erickson (incumbent)||17,440||22.10%|
|Democratic||Louis P. Donovan||10,212||12.94%|
|Democratic||John A. Lovelace||8,649||10.96%|
|Democratic||W. W. Hamilton||4,788||6.07%|
- Scott Leavitt, former United States Congressman from Montana's 2nd congressional district
- Wellington D. Rankin, former United States Attorney for the District of Montana, former Attorney General of Montana
- Leonard C. Young
- James A. Jergenson
|Republican||Wellington D. Rankin||18,150||33.50%|
|Republican||Leonard C. Young||6,202||11.45%|
|Republican||James A. Jergenson||4,344||8.02%|
|Democratic||James E. Murray||116,965||59.66%||-0.67%|
|Socialist||John F. Duffy||1,779||0.91%||+0.34%|
- "Report of the Official Canvass of the Vote Cast at the Primary Election, Held in the State of Montana, July 17, 1934". Montana Secretary of State. Retrieved July 2, 2014.
- "Statistics of the Congressional Election of November 6, 1934" (PDF). Clerk of the United States House of Representatives. Retrieved July 2, 2014.