William Booth Gardner (August 21, 1936 – March 15, 2013) was an American politician who served as the 19th governor of Washington, from 1985 to 1993. He also served as the ambassador of the General Agreement on Tariffs and Trade, or GATT. A member of the Democratic Party, Gardner served as a state senator from 1971 to 1973, and was the Pierce County Executive prior to his tenure as governor. His service was notable for advancing standards-based education and environmental protection.