Simeon Olcott (October 1, 1735 – February 22, 1815) was a New Hampshire attorney and politician. His career began before the American Revolution and continued afterwards, and among the positions in which he served were Chief Judge of the New Hampshire Supreme Court (1795-1801) and United States Senator from New Hampshire (1801-1805). Olcott died in Charlestown in 1815 and was buried at Forest Hill Cemetery in Charlestown.