Nahum Parker (March 4, 1760 – November 12, 1839) was a United States senator from New Hampshire.
He settled in Fitzwilliam, New Hampshire in 1786, was a member of the board of selectmen from 1790 to 1794 and clerk and town treasurer from 1792 to 1815.
He was elected as a Democratic-Republican to the U.S. Senate and served from March 4, 1807, to June 1, 1810, when he resigned.
From 1807 to 1813, Parker was a justice of the Court of Common Pleas for Cheshire and Sullivan Counties.
Parker died in Fitzwilliam, New Hampshire in 1839, aged 79, and was interred in the Town Cemetery.