William U. Saunders (1835 - ?) was a barber and lawyer who represented Gadsden County, Florida, in the Florida Legislature during the Reconstruction era.
He was born in Baltimore, Maryland. He served in the United States Colored Infantry from 1863-1866.
He was a delegate from Gadsden County to the 1868 Constitutional Convention of Florida despite having been in the county only a few days in his life, according to one account. He had been a barber in Illinois or Maryland. He was described as an eloquent speaker. In 1948 he was described as a Northern Radical Republican.
He traveled the state rallying Black voters.
Historian T. D. Allman wrote that racist revisionists tried to recast him as mulatto to deny his being a black man.