Nathan A. Farwell (February 24, 1812-December 9, 1893) was a politician, businessman and United States Senator from Maine. Born in Unity, Maine, he attended the common schools, and then taught school 1832-1833. He moved to East Thomaston, Maine, in 1834 and engaged in the manufacture of lime and in shipbuilding. Farwell subsequently became a master mariner and trader. He then studied law and moved to Rockland, Maine, where he founded the Rockland Marine Insurance Co., and served as president, as well as practing law in that city.
He was a member of the Maine State Senate from 1853 to 1854 and again 1861 to 1862, serving the last year as presiding officer. He was a member of the Maine House of Representatives in 1860 and again from 1863 to 1864. He was a delegate to the Baltimore National Republican convention in 1864, and in that year was appointed to the U.S. Senate as a Republican for the unexpired term of William Pitt Fessenden. He served in that body from October 27, 1864, to March 3, 1865, but was not a candidate for reelection in 1865. At that time he resumed his activities in the insurance business.
He was delegate to the Southern Loyalists Convention at Philadelphia in 1866. He traveled in Europe from 1845 till 1847.
Farwell died in Rockland, Maine and is buried in Achorn Cemetery.
