Joseph Simon Donnelly Sr. is an American attorney, politician, and diplomat. He served as the United States ambassador to the Holy See from 2022 to 2024 under President Joe Biden. Prior to his diplomatic post, Donnelly represented Indiana in both the U.S. House of Representatives and the U.S. Senate.
Donnelly's political career began with service on the Indiana State Election Board and the Mishawaka Marian School Board, where he was president from 2000 to 2001. He was elected to the U.S.