| Election Name: | 2008 Pennsylvania Senate election |
| Country: | Pennsylvania |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2006 Pennsylvania Senate election |
| Previous Year: | 2006 |
| Next Election: | 2010 Pennsylvania Senate election |
| Next Year: | 2010 |
| Seats For Election: | All odd-numbered seats in the Pennsylvania State Senate |
| Majority Seats: | 26 |
| Election Date: | November 4, 2008 |
| Leader1: | Joe Scarnati |
| Party1: | Republican Party (United States) |
| Leaders Seat1: | 25th District |
| Last Election1: | 29 |
| Seat Change1: | 1 |
| Seats1: | 14 |
| Seats After1: | 30 |
| Leader2: | Bob Mellow |
| Party2: | Democratic Party (United States) |
| Leaders Seat2: | 22nd District |
| Last Election2: | 21 |
| Seat Change2: | 1 |
| Seats2: | 11 |
| Seats After2: | 20 |
| Map Size: | 350px |
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.[1]
| Affiliation | Members | ||
|---|---|---|---|
| Democratic | 20 | ||
| Republican | 30 | ||
| Total | 50 | ||
(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.