Adamson Tannehill | |
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 Gravestone of Adamson Tannehill, Allegheny Cemetery in Pittsburgh, Pennsylvania | |
| Member of the U.S. House of Representatives from Pennsylvania's 14th district | |
| In office March 4, 1813 – March 3, 1815 | |
| Preceded by | Seat newly established |
| Succeeded by | John Woods |
| Personal details | |
| Born | May 23, 1750 Frederick County, Province of Maryland, British America |
| Died | December 23, 1820 Pittsburgh, Pennsylvania, USA |
| Resting place | Allegheny Cemetery, Pittsburgh, Pennsylvania, USA |
| Political party | Democratic-Republican |
| Spouse | Agnes Maria Morgan or Agnes Maria Heth |
| Profession | Military officer, politician, justice of the peace, and civic leader |
| Military service | |
| Allegiance | United States of America |
| Branch/service | |
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| Battles/wars | |
Adamson Tannehill (May 23, 1750 – December 23, 1820) was an American military officer, politician, civic leader, and active participant in the early development of Pittsburgh and western Pennsylvania. Born in Frederick County, Maryland, Tannehill was among the first volunteers to join the newly established Continental Army during the American Revolutionary War, serving from June 1775 until 1781. He reached the rank of captain and was commander of the Maryland and Virginia Rifle Regiment, the longest-serving Continental rifle unit of the war. He participated in several major engagements, including the battles of Trenton, Princeton, and Saratoga. After the conflict, Tannehill settled in Pittsburgh, Pennsylvania, his last military posting of the war. He was active in the Pennsylvania state militia, rising to the rank of major general in 1811. Tannehill also served as a brigadier general of United States Volunteers in the War of 1812.
Tannehill was an early citizen of Pittsburgh and a Pennsylvania politician who held numerous local, state, and national appointed and elected offices. These included one session as a Democratic-Republican in the Pennsylvania House of Representatives in 1791, one term in the U.S. House of Representatives from 1813 to 1815, and president of the Pittsburgh branch of the Bank of the United States from 1817 until his death in 1820. He also served on the founding boards of several civic and state organizations. In late 1800, Tannehill, while a justice of the peace, was alleged to have charged more than was allowed by law for two probate cases and was convicted of extortion. Shortly after, the governor of Pennsylvania remitted the charges and reinstated him to office.
Tannehill died in 1820 near Pittsburgh, Pennsylvania. He was buried at his Grove Hill home outside Pittsburgh and reinterred in Allegheny Cemetery in 1849.