John Klingensmith Jr. (26 March 1786-8 February 1854) was a member of the US House of Representatives (D-PA 19) from 4 March 1835 to 3 March 1839, succeeding Richard Coulter and preceding Albert G. Marchand. Born in Westmoreland County, he served as county sheriff from 1819 to 1822 and from 1828 to 1831, in Congress, and in the state senate from 1831 to 1835.