John Bradley Winslow (October 4, 1851 – July 13, 1920) was an American lawyer and jurist. He was the 10th Chief Justice of the Wisconsin Supreme Court, serving from 1908 until his death in 1920. Before being appointed to the Wisconsin Supreme Court, Winslow served as a Wisconsin circuit court judge for seven years and was city attorney of Racine, Wisconsin, from 1879 to 1883.