| Election Name: | 2004 Pennsylvania Senate election |
| Country: | Pennsylvania |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2002 Pennsylvania Senate election |
| Previous Year: | 2002 |
| Next Election: | 2006 Pennsylvania Senate election |
| Next Year: | 2006 |
| Seats For Election: | All odd-numbered seats in the Pennsylvania State Senate |
| Majority Seats: | 26 |
| Election Date: | November 2, 2004 |
| Leader1: | Robert Jubelirer |
| Party1: | Republican Party (United States) |
| Leaders Seat1: | 30th 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 2, 2004, with even-numbered districts being contested.[1] State Senators are elected for four-year terms, with half of the Senate seats up for a vote every two years.[2] The term of office for those elected in 2004 will run from January 4, 2005[3] through November 2008. Necessary primary elections were held on April 27, 2004.[4]
Bob Regola, a Republican member of the Hempfield Township Board of Supervisors, defeated Democratic senator Allen G. Kukovich in the 39th senatorial district. Republican State Representative Pat Vance succeeded the retiring Republican Senator Harold F. Mowrey, Jr. Four senators who won special elections prior to the 2004 election, Dominic F. Pileggi, Connie Williams, John R. Gordner, and John Pippy, each won full terms.[5]
| Affiliation | Members | ||
|---|---|---|---|
| Republican Party | 30 | ||
| Democratic Party | 20 | ||
| Total | 50 | ||