Whitman Ashby Barber (October 17, 1853 – February 23, 1930) was an American businessman and politician.
Born on a farm in the town of Lyndon, near Waldo, Sheboygan County, Wisconsin, Barber went to Ripon College, for one year, and then taught school in Silver Creek, Wisconsin.
In 1874, Barber was appointed United States gauger.
Barber served as chairman and assessor of the Town of Lyndon.
In 1899, Barber served in the Wisconsin State Assembly and was a Republican.