John Clack (1757 – January 1833) was an American politician and military officer from Tennessee. He served in the American Revolutionary War as a captain. He served in the Tennessee Senate from 1796 to 1797 and in the Tennessee House of Representatives for three non-consecutive terms in the 1810s and 1820s.

Early life John Clack was born in Virginia in 1757.

Clack served in the American Revolutionary War and fought at the battles of Guilford Court House and the Cowpens. According to his descendants, Clack received the surrender of Banastre Tarleton's cavalry after its defeat at Cowpens. He also fought at the Battle of Stony Point. He attained the rank of captain. He left his home in Abingdon, with his older brother Spencer to move to Tennessee. He first lived in Paint Rock, near the North Carolina border. They ultimately both settled in Sevier County.

Career in Tennessee Clack served as a justice of the peace in Sevier County in 1794 and was elected again in July 1795 and April 1796. Clack and his brother Spencer represented Sevier County in the 1796 Tennessee Constitutional Convention. He served on the committee that drafted the state's constitution. He served in the first and second assemblies of the Tennessee Senate, representing Sevier County, from 1796 to 1797.

In 1815, Clack moved with his family to Giles County. He then represented Giles County in the Tennessee House of Representatives from 1815 to 1817, 1819 to 1821, and 1823 to 1825.

Personal life Clack married Sally Standifer, daughter of James Standifer, in Henry County, Virginia, on November 4, 1779. They had one son and nine daughters, including Spencer, Martha, Hannah, Fanny, Naomi, and Mrs. Dickson. His son Spencer married Lucy Williams Jones, the sister of Thomas McKissick Jones. His brother Spencer, his son Spencer, and his grandson Thomas Jones Clack were Tennessee legislators.

Clack died in January 1833 at his "Mount Moriah" estate six miles west of Pulaski.

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