William Darrah Kelley was an American politician from Philadelphia who served as a Republican member of the U.S. House of Representatives for Pennsylvania's 4th congressional district from 1861 to 1890.

Pennsylvania's fourth congressional district, effective January 3, 2023, encompasses the majority of Montgomery County and most of Berks County northeast of Reading in southeastern Pennsylvania. In the 2020 redistricting cycle, the Pennsylvania district pushed northwards, further into Berks County, effective with the 2022 elections. The area has been represented by Democrat Madeleine Dean since 2019.