Foster Lonnie Campbell Jr. (born January 6, 1947) is an American politician and member of the Democratic Party from the U.S. state of Louisiana. Since 2003, he has been a member of the Louisiana Public Service Commission. He served in the Louisiana State Senate from 1976 to 2002. In 2012, Campbell became chairman of the five-member Public Service Commission. He was re-elected to a third term on the commission in 2014. He won a fourth six-year term as Louisiana Public Service Commissioner in 2020.