John W. Champlin (1831–1901) was a member of the Michigan Supreme Court from 1884 until 1891.
Champlain was born in Kingston, New York and came to Grand Rapids, Michigan as an adult to study law with his brother. He served as a judge of the Grand Rapids Recorders' Court and then as mayor of Grand Rapids starting in 1867. In 1883 Champlin defeated Austin Blair in the election for the vacant seat on the Michigan Supreme Court.
After leaving the Supreme Court Champlin served as a law professor at the University of Michigan.
Buried in Fulton Street Cemetery