William Emmett Dever (March 13, 1862 – September 3, 1929) was the mayor of Chicago from 1923 to 1927. He had previously served as a judge and before that an alderman. As an alderman and judge he would work to become the Democratic candidate for mayor for over two decades. Born in Massachusetts but moving to Chicago in young adulthood, William Dever became an alderman and prominently supported municipal ownership of mass transit. He was a member of the Dunne wing of the local Democratic party.