James Loren Martin (September 13, 1846–January 14, 1915) was a Vermont lawyer, politician, and federal judge.
Martin was born in Landgrove, Vermont. He was educated in the schools of Londonderry, Vermont and Marlow, New Hampshire and received an LL.B. from Albany Law School in 1869. He practiced law, first in Londonderry, and later in Brattleboro.
A Republican, he was State's Attorney for Windham County from 1874 to 1876. He served in the Vermont House of Representatives from 1874 to 1882 (from Londonderry) and 1892 (from Brattleboro). From 1878 to 1882 he was Speaker of the House.
Martin was the state commissioner of taxes in 1888, 1890 to 1892, and 1894. He served as U.S. Attorney for the District of Vermont from 1898 to 1906.
Martin received a recess appointment to the United States District Court for the District of Vermont from President Theodore Roosevelt on October 20, 1906, to the seat vacated by Hoyt H. Wheeler. Formally nominated on December 3, 1906, he was confirmed by the Senate on December 11, 1906, and received his commission the same day.