Elijah Hunt Mills (born December 1, 1776) was a United States Senator from Massachusetts who served in the early nineteenth century. A member of the Adams party, he represented Massachusetts in the U.S. Senate from December 4, 1815, to March 3, 1827. Over the course of his Senate service, he completed four terms, reflecting a sustained role in national politics during a formative period in the republic’s history.

Mills served as a senator rather than a representative of a specific congressional district, and he is recorded as a historical member of Congress from Massachusetts. His tenure in the Senate placed him among the prominent New England figures aligned with the Adams political tradition. After leaving office in 1827, he is regarded as a former senator, with no further official positions or committee assignments listed in the available record.