1804 United States presidential election in Pennsylvania

A presidential election was held in Pennsylvania on November 2, 1804, as part of the 1804 United States presidential election. The Democratic-Republican Party's ticket of incumbent president Thomas Jefferson and former New York governor George Clinton defeated the Federalist Party's ticket.

The Democratic-Republican members of the Pennsylvania General Assembly held a caucus on March 22 and nominated electors pledged to Jefferson and Clinton. The Federalists were disorganized and pessimistic about their ability to carry the state. A gathering of Federalists met in Gettysburg, Pennsylvania, on October 25 and belatedly nominated electors; although a clandestine meeting of Congressional Federalists had nominated Charles Cotesworth Pinckney for president in February, the Federalist ticket was formally unpledged. Predictions that the Federalists would seek to exploit factionalism within the Pennsylvania Democratic-Republican Party proved unfounded, for Jefferson carried all but one of the state's 32 counties with nearly 95 percent of the votes.