John Ritter (February 6, 1779 – November 24, 1851) was a Democratic member of the U.S. House of Representatives from Pennsylvania.
John Ritter was born in Exeter, Pennsylvania. He received a limited schooling and apprenticed as a printer. He was a member of the State constitutional convention in 1836.
Ritter was elected as a Democrat to the Twenty-eighth and Twenty-ninth Congresses. He was not a candidate for renomination in 1846. He served as editor and publisher of the Adler, a German newspaper, at Reading, Pennsylvania. He died in Reading in 1851. Interment in Reading's Charles Evans Cemetery.