Samuel Osgood (February 3, 1747 – August 12, 1813) was an American merchant and statesman from Andover, Massachusetts. He served in the Massachusetts and New York state legislatures, represented Massachusetts in the Continental Congress and was the first Postmaster General under the United States Constitution.
Samuel attended Dummer Academy (now The Governors Academy), and then Harvard College, where he studied theology and graduated in 1770. But he returned to Andover and followed a mercantile career. He joined the local militia, was elected to represent the town in the colonial assembly and in 1775 to the provincial congress that functioned as a revolutionary government.
The Provincial Congress named Osgood to the Massachusetts Board of War and he served there until 1780 when the government was reorganized. He was a delegate to the state's constitutional convention in 1779-1780. Under the new Constitution he was elected to the Massachusetts State Senate in 1780. That same year the new government named Osgood as one of their delegates to the Continental Congress and he served there from 1782 until 1784.
After a brief term in the Massachusetts House of Representatives in 1784, the governor appointed Osgood a judge in 1785 but he soon resigned when the National Congress made him a commissioner of the Treasury later that year. He moved to New York City to take up this office, which he held until the Congressional Government ended.
In 1800, Osgood was elected to the New York State Assembly, and served there until 1803. In 1801 he was its Speaker. In 1803, he was appointed to a national post as chief naval officer for the port of New York, a position he held until his death. In 1812, he was elected the first President of the then newly-formed City Bank of New York, which later became Citibank, predecessor of today's Citigroup.
Osgood was a member of American Philosophical Society, and in his later years devoted time to writing and study. He had an extensive correspondence with George Washington and Thomas Jefferson among others. He died at home in New York in 1813 and was buried in the Brick Presbytian Church in Manhattan The church was located at what is now at Fifth Avenue and Thirty-seventh street.
Two streets in North Andover, Massachusetts are named after him and a portrait hangs in the U.S. Senate.