The 1930 United States Senate election in Montana took place on November 3, 1936. Incumbent United States Senator
James E. Murray, who was first elected to the Senate in a special election in
1934, ran for re-election. He narrowly emerged from a competitive and close
Democratic primary, wherein he was challenged by
United States CongressmanJoseph P. Monaghan, who represented
Montana's 1st congressional district. In the general election, Murray was opposed by Thomas O. Larson, a
State Senator and the
Republican nominee, and Monaghan, who, after losing the primary, ran as an
independent candidate. Murray ended up winning a second term, and his first full term, in a landslide, defeating both of his opponents by a comfortable margin.