| Election Name: | 1918 United States Senate election in Maine |
| Country: | Maine |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1916 United States Senate special election in Maine |
| Previous Year: | 1916 (special) |
| Next Election: | 1924 United States Senate election in Maine |
| Next Year: | 1924 |
| Election Date: | September 9, 1918 |
| Image1: | File:FERNALD, BERT M. SENATOR LCCN2016857531 (cropped).jpg |
| Nominee1: | Bert Fernald |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 67,431 |
| Percentage1: | 55.40% |
| Nominee2: | Elmer Newbert |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 54,289 |
| Percentage2: | 44.60% |
| Map Size: | 250px |
| U.S. Senator | |
| Before Election: | Bert Fernald |
| Before Party: | Republican Party (United States) |
| After Election: | Bert Fernald |
| After Party: | Republican Party (United States) |
The 1918 United States Senate election in Maine was held on September 9, 1918.
Incumbent Republican U.S. Senator Bert Fernald, who had been elected to fill the unexpired term of the late Senator Edwin C. Burleigh, was elected to a full term in his own right, defeating Democrat Elmer Newbert.
Senator Fernald was unopposed for re-nomination.
Newbert was unopposed for the Democratic nomination.