James Knox Polk Hall (September 30, 1844 – January 5, 1915) was a Democratic member of the U.S. House of Representatives from Pennsylvania.

He was elected district attorney of Elk County, Pennsylvania in 1867, and reelected in 1870 and 1873.

He retired from the practice of law in 1883 to engage in the coal, lumber, and railroad businesses as well as banking.

Hall was elected as a Democrat to the Fifty-sixth and Fifty-seventh Congresses and served until his resignation.

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