John Theryll Knox (September 30, 1924 – April 3, 2017) was an American politician and lawyer.
He served in the California State Assembly and as Speaker Pro Tempore.
He was a Democrat.Knox was born in Reno, Nevada and moved to California with his parents in 1929.
He served in the United States Army Air Forces during World War II.
He received his bachelor's degree from Occidental College and his law degree from University of California, Hastings College of the Law.
Knox was admitted to the California bar in 1953 and practiced law in Richmond, California.
He died at a hospital in Richmond, California after a long illness.