Elections for the Pennsylvania State Senate were held on November 4, 2008, with odd-numbered districts being contested. Republicans had a net gain of 1 seat for the 2008 elections, expanding their majority to 30-20. State Senators are elected for four-year terms, with half of the Senate seats up for a vote every two years. The term of office for those elected in 2008 will run from December 1, 2008 until December 1, 2012. Necessary primary elections were held on April 22, 2008.

Make-up of the Senate following the 2008 elections

Affiliation		Members
	Democratic Democratic Party (United States) The Democratic Party is one of two major contemporary political parties in the United States, along with the Republican Party. The party's socially liberal and progressive platform is largely considered center-left in the U.S. political spectrum. The party has the lengthiest record of continuous...	20
	Republican Republican Party (United States) The Republican Party is one of the two major contemporary political parties in the United States, along with the Democratic Party. Founded by anti-slavery expansion activists in 1854, it is often called the GOP . The party's platform generally reflects American conservatism in the U.S...	30
Total		50

General Elections

(see note)
¹ Senator Rhoades died prior to the election but remained on the ballot. As he was posthumously re-elected, his seat will be filled by a special election.