Elections to the United States House of Representatives were held in Pennsylvania on October 13, 1812, for the 13th Congress.

The two incumbents who lost re-election lost to members of the same party, while six of the seven open seats were won by Democratic-Republicans, a net increase of 5 seats for the Democratic-Republicans and no change for the Federalists.

Smilie was replaced by Isaac Griffin in a special election held February 16, 1813.

They were replaced in special elections held on October 12, 1813 Both took their seats December 6, 1813, at the start of the 2nd session.

With Crouch's victory in the 3rd district, the sole Federalist-held seat in Pennsylvania changed to Democratic-Republican control, thus Pennsylvania's delegation was completely Democratic-Republican during the 2nd session, which lasted December 6, 1813 - April 18, 1814[5] Jonathan Roberts (DR) of the 2nd district resigned February 24, 1814, upon being elected to the Senate and James Whitehill (DR) of the 3rd district resigned September 1, 1814.