| Thomas Shannon | |
| State1: | Ohio |
| Term Start1: | December 4, 1826 |
| Term End1: | March 3, 1827 |
| Preceded1: | David Jennings |
| Succeeded1: | John Davenport |
| Office2: | Member of the Ohio House of Representatives from Belmont County |
| Term Start2: | 1824 |
| Term End2: | 1825 |
| Preceded2: | New district |
| Succeeded2: | William Dunn William Perrine |
| Office3: | Member of the Ohio House of Representatives from Belmont and Monroe counties |
| Term Start3: | 1819 |
| Term End3: | 1823 |
| Preceded3: | William Dunn Charles Hammond George Paull |
| Succeeded3: | Isaac Atkinson William Perrine John Scatterday |
| Office4: | Member of the Ohio Senate from Belmont County |
| Term Start4: | December 7, 1829 |
| Term End4: | December 4, 1831 |
| Preceded4: | William Blackstone Hubbard |
| Succeeded4: | William Dunn |
| Term5: | 1837-1843 |
| Party: | Adams |
| Birth Date: | 15 November 1786 |
| Birth Place: | Washington County, Pennsylvania, US |
| Death Place: | Barnesville, Ohio, US |
| Restingplace: | Green Mount Cemetery |
Thomas Shannon (November 15, 1786 - March 16, 1843) served briefly as a U.S. Representative from Ohio from December 1826 to January 1827.
Born in Washington County, Pennsylvania, he attended public schools and moved to Ohio with his parents, who settled in Belmont County, Ohio in 1800. He engaged in agricultural pursuits and later moved to Barnesville in Belmont County in 1812 where he entered the mercantile business. During the War of 1812 served as captain of Belmont County Company in Colonel John Delong’s regiment.
He served as a member of the Ohio House of Representatives from 1819 to 1822 and again in 1824 and 1825. In 1826, he was elected as an Adams candidate to the 19th Congress to fill the vacancy caused by the resignation of David Jennings and served from December 4, 1826, to March 3, 1827.
He did not seek renomination in 1827 and returned to Barnesville, Ohio, where he became a leaf-tobacco merchant. He was elected to and served in the Ohio State Senate in 1829 and again from 1837 to 1843. He died in Barnesville and is interred in Green Mount Cemetery.
Thomas Shannon was the brother of Wilson Shannon, Governor of Ohio and Territorial Governor of Kansas Territory.