Philetus Swift (June 26, 1763 Kent, Litchfield County, Connecticut – July 24, 1828 Phelps, Ontario County, New York) was an American politician.
He was the son of Elisha Swift (b. 1731) and Mary Ransom (b. 1738). One of Swift's older brothers was future Brigadier General John Swift. On April 4, 1786, he married his first wife Electra Goodrich in Sharon, Connecticut. On May 22, 1793, he married his second wife Sally Deane (1774–1820?) in Phelps, N.Y., and their son was Deane Swift (1794–1818). On November 26, 1823, he married his third wife Fanny (or Fauna, Fawnia, Faunia) Cole (ca. 1792–1880), and their daughter was Electra Jane Swift (1825-1904).
He was a member of the New York State Assembly from Genesee, Ontario and Allegany Counties in 1807 and 1808, and from Ontario County in 1823.
He fought in the War of 1812, and became a lieutenant colonel.
He was a member from the Western District of the New York State Senate from 1810 to 1815 and from 1816 to 1818. In February 1817, when John Tayler became Acting Governor of New York after the resignation of Daniel D. Tompkins, Swift was elected President pro tempore of the State Senate.