| Office: | U.S. Assistant Secretary of the Treasury |
| Term Start: | March 14, 1853 |
| Term End: | March 12, 1857 |
| Predecessor: | William L. Hodge |
| Successor: | Philip Clayton |
| Birth Date: | 31 August 1798 |
| Birth Place: | Virginia, US |
| Death Place: | New York City, US |
Peter Grayson Washington (August 31, 1798 – February 10, 1872) was an American official who served as U.S. Assistant Secretary of the Treasury.
Washington was born in 1798 in Virginia. He was a son of Susan Monroe (Grayson) Washington (1770–1822) and Lund Washington (1767–1853), the postmaster of Washington, D.C.[1] After his mother's death in 1822, his father married Sarah Johnson, a daughter of Capt. John Johnson.
His father was named for his uncle, Lund Washington, who was the neighbor and distant cousin of President George Washington. His paternal grandparents were Robert Washington and Alice (Strother) Washington. His maternal grandparents were Mary Elizabeth (Wagener) Grayson and the Rev. Spence Monroe Grayson,[2] brother of U.S. Senator William Grayson (through their mother, they were cousins of James Monroe).[3]
Washington began his career as a clerk in the United States Treasury.[4] He was later promoted to Chief Clerk of the Treasurer's Office, Chief Clerk of Sixth Auditor; First Assistant Postmaster General, and Assistant Secretary of the Treasury under Secretary James Guthrie and Howell Cobb under Presidents Franklin Pierce and James Buchanan. He was a vice president of the Oldest Inhabitants' Association of New York City and was a member of the Washington National Monument Association.[5]
In 1822, Washington was married to Margaret MacPherson (1786–1874), a daughter of Gen. William MacPherson and Margaret Stout MacPherson. Margaret's younger brother, Joseph Stout MacPherson, was married to Peter's younger sister, Mary Elizabeth Washington.[6] Together, they were the parents of:[7]
Washington died in New York City on February 10, 1872. His funeral was held in Washington at the Church of the Epiphany and conducted by the Rev. Dr. Starkey.[8]