The 2018 elections for the Pennsylvania State Senate were held on November 6, 2018, with 25 of 50 districts being contested. Primary elections were held on May 15, 2018. The term of office for those elected in 2018 began when the Senate convened in January 2019. Pennsylvania State Senators are elected for four-year terms, with half of the seats up for election every two years.

Steven J. Santarsiero is an American attorney and politician. A member of the Democratic Party, he has represented the 10th District in the Pennsylvania State Senate since 2019. Santarsiero previously served in the Pennsylvania House of Representatives, representing the 31st District between 2009 and 2016.