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.