| Election Name: | 1952 United States Senate election in Montana |
| Country: | Montana |
| Flag Year: | 1905 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1946 United States Senate election in Montana |
| Previous Year: | 1946 |
| Next Election: | 1958 United States Senate election in Montana |
| Next Year: | 1958 |
| Election Date: | November 4, 1952 |
| Image1: | Michael Joseph Mansfield.jpg |
| Nominee1: | Mike Mansfield |
| Party1: | Democratic Party (US) |
| Popular Vote1: | 133,109 |
| Percentage1: | 50.75% |
| Party2: | Republican Party (US) |
| Popular Vote2: | 127,360 |
| Percentage2: | 48.56% |
| U.S. Senator | |
| Before Party: | Republican Party (US) |
| After Party: | Democratic Party (US) |
The 1952 United States Senate election in Montana took place on November 4, 1952. Incumbent United States Senator Zales Ecton, who was first elected to the Senate in 1946, ran for re-election. Ecton won the Republican primary uncontested, and advanced to the general election, where he faced Mike Mansfield, the United States Congressman from Montana's 1st congressional district and the Democratic nominee. Following a close campaign, Mansfield narrowly defeated Ecton, winning his first of several terms in the Senate.