Joseph Merrill Hoeffel III is an American author and politician. A Democrat, Hoeffel was a member of the United States House of Representatives from 1999 to 2005, representing Pennsylvania's 13th congressional district. He also served multiple terms on the Montgomery County Board of Commissioners, and from 1977–84, was a member of the Pennsylvania House of Representatives. A native of Philadelphia, he is a graduate of Boston University and Temple University School of Law.

The 13th congressional district of Pennsylvania is a congressional district in the U.S. state of Pennsylvania. The district contains all of Adams, Bedford, Blair, Cambria, Franklin, Fulton, Huntingdon, Juniata, Mifflin, and Perry counties. It also includes slivers of Cumberland and Somerset counties. Republican John Joyce has represented the district since 2019. With a Cook Partisan Voting Index rating of R+25, it is the most Republican district in Pennsylvania.