See also: 2020 Pennsylvania elections.
| Election Name: | 2020 Pennsylvania Senate election |
| Country: | Pennsylvania |
| Type: | legislative |
| Vote Type: | Popular |
| Ongoing: | no |
| Previous Election: | 2018 Pennsylvania Senate election |
| Previous Year: | 2018 |
| Next Election: | 2022 Pennsylvania Senate election |
| Next Year: | 2022 |
| Seats For Election: | All odd-numbered seats in the Pennsylvania State Senate |
| Majority Seats: | 26 |
| Image1: | File:Joe Scarnati.jpg |
| Party1: | Pennsylvania Republican Party |
| Leaders Seat1: | 25th |
| Last Election1: | 29 |
| Seats Before1: | 28 |
| Seats1: | 15 |
| Seats After1: | 28 |
| Popular Vote1: | 1,636,593 |
| Percentage1: | 50.87% |
| Leader2: | Jay Costa |
| Party2: | Pennsylvania Democratic Party |
| Leaders Seat2: | 43rd |
| Last Election2: | 21 |
| Seats Before2: | 21 |
| Seats2: | 10 |
| Seats After2: | 21 |
| Popular Vote2: | 1,580,922 |
| Percentage2: | 49.13% |
| Image4 Size: | 160px |
| Party4: | Independent (US) |
| Last Election4: | 0 |
| Seats Before4: | 1 |
| Seats4: | 0 |
| Seats After4: | 1 |
| Map Size: | 350px |
| President Pro Tempore | |
| Before Election: | Joe Scarnati |
| Before Party: | Pennsylvania Republican Party |
| Posttitle: | President Pro Tempore |
| After Election: | Jake Corman |
| After Party: | Pennsylvania Republican Party |
The 2020 elections for the Pennsylvania State Senate were held on November 3, 2020, with 25 of 50 districts being contested. Primary elections were held on June 2, 2020.[1] The term of office for those elected in 2020 began when the Senate convened in January 2021. Pennsylvania State Senators are elected for four-year terms, with half of the seats up for election every two years.[2] The election coincided with the 2020 United States presidential election, United States House of Representatives elections, and the entirety of the Pennsylvania House of Representatives.
Republicans had controlled the chamber since the 1994 election (years).
A special election for the 48th senatorial district was held on January 14 following Republican State Senator Mike Folmer's resignation after being arrested for possession of child pornography.[3] Democrats selected Lebanon Valley College associate professor Michael Schroeder as their nominee, while Republicans nominated Lebanon County District Attorney Dave Arnold.[4]
| Affiliation | Candidates | Votes | % | Seats before | Seats up | Seats won | Seats after | ||
|---|---|---|---|---|---|---|---|---|---|
| Republican | 20 | 1,636,593 | 50.87 | 28 | 15 | 15 | 28 | ||
| Democratic | 24 | 1,580,922 | 49.13 | 21 | 10 | 10 | 21 | ||
| Independent | 0 | 0 | 0 | 1 | 0 | 0 | 1 | ||
| Total | TBD | 3,217,515 | 100 | 50 | 25 | 25 | 50 | ||
Six district races had winning margins of less than 15%:
| District | Winner | Margin | ||
|---|---|---|---|---|
| District 9 | data-sort-value=1 | Democratic (flip) | 3.9% | |
| District 13 | data-sort-value=1 | Republican | 11.26% | |
| District 15 | data-sort-value=1 | Republican | 3.46% | |
| District 19 | data-sort-value=1 | Democratic | 14.90% | |
| District 37 | data-sort-value=1 | Republican (flip) | 4.14% | |
| District 45 | data-sort-value=1 | Democratic | 0.06% |