| Election Name: | 1946 United States Senate election in Maine |
| Country: | Maine |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1940 United States Senate election in Maine |
| Previous Year: | 1940 |
| Next Election: | 1952 United States Senate election in Maine |
| Next Year: | 1952 |
| Election Date: | September 9, 1946 |
| Image1: | File:Owen Brewster 4a.jpg |
| Nominee1: | Owen Brewster |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 111,215 |
| Percentage1: | 63.55% |
| Nominee2: | Peter McDonald |
| Party2: | Democratic Party (US) |
| Popular Vote2: | 82,665 |
| Percentage2: | 36.45% |
| Map Size: | 250px |
| U.S. Senator | |
| Before Election: | Owen Brewster |
| Before Party: | Republican Party (US) |
| After Election: | Owen Brewster |
| After Party: | Republican Party (US) |
The 1946 United States Senate election in Maine was held on September 9, 1946.
Incumbent Republican Senator Owen Brewster was re-elected to a second term in office over Democrat Peter McDonald.
Senator Brewster was unopposed for re-nomination.
McDonald was unopposed for the Democratic nomination.