The 2018 Pennsylvania gubernatorial election took place on November 6, 2018, to elect the Governor and Lieutenant Governor of Pennsylvania, concurrently with the election of Pennsylvania's Class I U.S. Senate seat, as well as elections to the United States House of Representatives and various local elections. Incumbent Governor Tom Wolf won a second term by a double-digit margin, defeating Republican challenger Scott Wagner and two third-party candidates from the Green Party, Paul Glover and Libertarian Party, Ken Krawchuk. The primary elections were held on May 15. This was the only Democratic-held governorship up for election in a state that Donald Trump won in the 2016 presidential election.
Wagner won eight counties that Wolf won in 2014: Lawrence, Greene, Fayette, Cambria, Clinton, Northumberland, Carbon, and Schuylkill. Meanwhile, this was the first time since Bob Casey Jr.'s landslide State Treasurer win in 2004 that Cumberland County voted for the Democrat in a statewide election.
Incumbent Lieutenant Governor Mike Stack faced several controversies during his term, including mistreatment of state police officers assigned as his security detail. As a result, he faced several challengers in the primary, including 2016 Senate candidate John Fetterman. Stack was ultimately defeated by Fetterman, placing fourth overall.