# 1918 United States Senate election in Montana

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The 1918 United States Senate election in Montana took place on November 5, 1918. Incumbent United States Senator Thomas J. Walsh, who was first elected to the Senate in 1912, ran for re-election. He won the Democratic primary uncontested, and was opposed in the general election by Oscar M. Lanstrum, a former State Representative and the Republican nominee, and Jeannette Rankin, one of two United States representatives from Montana's at-large congressional district and the nominee of the National Party. Walsh narrowly won his second term in the Senate.

## Democratic primary
### Candidates

* Thomas J. Walsh, incumbent United States Senator

### Results

Democratic Party primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Thomas J. Walsh (incumbent) | 28,553 | 100.00% |
| Total votes | Total votes | Total votes | 28,553 | 100.00% |

## Republican primary
### Candidates

* Oscar M. Lanstrum, former State Representative
* Jeannette Rankin, one of two Congressional representatives from Montana's at-large congressional district
* Harry H. Parsons, attorney
* Edmund Nichols

### Results

Republican Primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Oscar M. Lanstrum | 18,805 | 41.59% |
| | Republican | Jeannette Rankin | 17,091 | 37.80% |
| | Republican | Harry H. Parsons | 5,878 | 13.00% |
| | Republican | Edmund Nichols | 3,443 | 7.61% |
| Total votes | Total votes | Total votes | 45,217 | 100.00% |

## General election
### Results

1918 United States Senate election in Montana :
| Party | Party | Candidate | Votes | % | ±% |
| | Democratic | Thomas J. Walsh (incumbent) | 46,160 | 41.07% | −0.10% |
| | Republican | Oscar M. Lanstrum | 40,229 | 35.79% | +9.06% |
| | National | Jeannette Rankin | 26,013 | 23.14% | |
| Majority | Majority | Majority | 5,931 | 5.28% | −3.79% |
| Turnout | Turnout | Turnout | 112,402 | | |
| | Democratic hold | Democratic hold | Swing | | |