John Pierce Campbell Jr. (8 December 1820-29 October 1888) was a member of the US House of Representatives (KN-KY 2) from 4 March 1855 to 3 March 1857, succeeding Benjamin E. Grey and preceding Samuel Peyton. Born in Hopkinsville, he practiced law in Lexington, Missouri and served in the state house from 1848 to 1852 before farming in Hopkinsville and serving as a congressman and president of railroad and coal companies.