William Cage (1745 - March 1811) was a politician in North Carolina and Tennessee and an early settler in Tennessee. He was a member of the North Carolina House of Representatives (then called the House of Commons) in 1783 and 1784. He briefly held the position of State Treasurer and Speaker of the State House of Representatives in the 18th century, from August 1784–June 1785, representing the proposed State of Franklin.
William Cage was born in Virginia in 1745. Before the American Revolutionary War he moved to Chatham County, North Carolina. During the war he served as a major in the United States Army under David Fanning. After the war he moved to Sullivan County, North Carolina where he was elected to the North Carolina House of Representatives (then called the House of Commons) in sessions in 1783 and 1784. The other legislators from Sullivan County at that time were Colonel Abraham Bledsoe and David Looney. In 1874, there was a movement to form the state of Franklin from a group of western North Carolina counties. Cage took a central role in the movement, and was appointed treasurer and elected speaker of the lower house of the first assembly of the provisional state, serving from August 1784–June 1785. 
In 1785 he moved further west to what is now Sumner County, Tennessee with the Bledsoe family. The Southwest Territory was organized in 1790 to govern the area, and Cage was appointed by Governor William Blount sheriff of Sumner county, a position he held until 1796 when he was succeeded by his son James Cage.  Cage was a member of the first session of the Court of Pleas and Quarter Sessions after Tennessee statehood in 1796. 
William Cage died at his home in Sumner County in March 1811. He had at least two sons, the aforementioned James and another, Harry, who moved to Mississippi where he was a legislator and judge. Two of his grandsons were also notable, Harry T. Hays and John Coffee Hays.<  He also had four daughters. 
The area along the Cumberland River near his home is now known as Cage's Bend  and is the location of Cage's Bend State Park.
- Williams, Samuel Cole. History of the Lost State of Franklin Press of the Pioneers, New York, 1933 p313 
- Foster, Austin P. Counties of Tennessee: A Reference of Historical and Statistical Facts for Each of Tennessee's Counties. The Overmountain Press, 1998 p88
- McFerrin, John Berry. History of Methodism in Tennessee, Volume 2, Publishing House of the M. E. Church, 1886 p193