William Jack (July 29, 1788 – February 28, 1852) was an American lawyer and politician who served one term as a Democratic member of the U.S. House of Representatives from Pennsylvania.
He moved to Brookville, Pennsylvania, in 1831 and engaged in mercantile pursuits.
He served as sheriff of Brookville in 1833, and was a contractor and builder in Mississippi and assisted in the construction of a canal there.
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