William Marshall Thomas (born December 6, 1941), commonly known as Bill Thomas, is an American politician, and the Republican member of the United States House of Representatives from 1979–2007, most recently representing California's 22nd congressional district. He last served as the Chairman of the House Ways and Means Committee, and retired at the end of the 109th Congress.
Thomas was born in Wallace, Idaho, moving with his parents to the Southern California area. He graduated from Garden Grove High School, attended Santa Ana College, earning an associate's degree before transferring to San Francisco State University, where he earned his bachelor's degree and master's degree in political science in 1963 and 1965, respectively. He became an instructor at Bakersfield College before running in the California State Assembly in 1974. He won election to the House of Representatives in 1978, representing the 18th congressional district.
Thomas married the former Sharon Lynn Hamilton in 1968. They have two grown children, Christopher and Amelia. He and his family are Baptists.