The 1970 United States Senate election in Maine was held on November 3, 1970. Incumbent Democrat Edmund Muskie defeated Republican nominee Neil S. Bishop with 61.74% of the vote. It's believed Muskie's coattails helped Democratic Governor Kenneth Curtis narrowly win reelection in the concurrent gubernatorial election. Bishop had crossed party lines to support Muskie's first run for high office, becoming a prominent Republican endorser when Muskie ran for Governor of Maine in 1954.
Primary elections were held on June 15, 1970.