Mary Gay Scanlon is an American attorney and politician. She is a member of the United States House of Representatives, representing Pennsylvania’s 5th congressional district, since being sworn into office on January 3, 2019. The district encompasses all of Delaware County and part of South Philadelphia. She was sworn in as the member representing Pennsylvania’s 7th congressional district on November 13, 2018. She was elected to both positions on November 6, 2018. That day, she ran in a special election in the old 7th to serve out the term of her predecessor, Pat Meehan and in a regular election for a full two-year term in the new 5th. She is a member of the Democratic Party.