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.
|Republican||Zales Ecton (incumbent)||71,629||100.00|
|Republican||Zales Ecton (incumbent)||127,360||48.56%||-4.92%|
|Democratic gain from Republican||Swing|
- "Report of the Official Canvass of the Vote Cast at the Primary Election Held in the State of Montana, July 15, 1952" (PDF). Montana Secretary of State. Archived from the original (PDF) on 2013-12-28. Retrieved July 2, 2014.
- "Statistics of the Presidential and Congressional Election of November 4, 1952" (PDF). Clerk of the United States House of Representatives. Retrieved July 4, 2014.