Truman Boardman (February 7, 1810 – April 21, 1895) was an American farmer and politician from New York.
He was the son of Allyn Boardman (1774–1837), a tanner and currier who came from Connecticut to Western New York in 1799, and Phoebe (Woodworth) Boardman (1776–1851). Truman Boardman was born in that part of the Town of Ovid, in Seneca County, New York, which was separated in 1817 as the Town of Covert. On June 5, 1834, he married Aurelia Chloe Whiting (1810–1893), and they had four children. He was elected Supervisor of the Town of Covert in 1849, 1851 and 1852.
He was a member of the New York State Senate (26th D.) in 1858 and 1859. In 1863, he removed to Trumansburg, New York. He was a member of the New York State Assembly (Tompkins Co.) in 1881.
His brother, Supreme Court Justice Douglas Boardman (1822–1891), was the first Dean of Cornell Law School, and lived in the Boardman House (Ithaca, New York).