William Brewster Williams (July 28, 1826 – March 4, 1905) was a politician and judge from the U.S. State of Michigan. Williams was born in Pittsford, New York. He attended the common schools, received an academic education, and graduated from the State and National Law School, Ballston Spa, New York in 1851. He was admitted to the bar the same year and commenced practice in Rochester, New York. He moved to Allegan, Michigan in 1855.