John Chamberlain Clark (January 14, 1793 – October 25, 1852) was an American lawyer and politician who served four terms as a United States representative from New York from 1827 to 1829 and from 1837 to 1843.
Clark then studied law, was admitted to the bar and commenced practice in Hamilton, New York.
A Democratic-Republican, then a Jacksonian and later a Democrat, he served as District Attorney of Chenango County from 1823 to 1827.
He began his term as a Democrat, but switched to the Whig Party in 1837 because he favored continuation of the Second Bank of the United States rather than the independent Treasury favored by President Martin Van Buren and the Democrats.
Following the Whig victory in the 1848 election for President, Clark was appointed First Auditor of the Treasury and he served from August 2, 1849, to October 31, 1849.