Ashton Cokayne Shallenberger (December 23, 1862 – February 22, 1938) was an American Democratic politician and the 15th Governor of Nebraska from 1909 to 1911.

After a move to Stromsburg, Polk County, Nebraska, in 1881, Shallenberger became a clerk, a banker and a rancher.

According to Southwest Virginia folklore, in 1902 Shallenberger, Alma Journal editor H. S. Wetherald, and carriage dealer Frank Griggsby, were startled by the apparition of a Woman in Black.

[4] His first attempt at the Governorship came in 1906, running under a Fusion label of the state Democratic and Populist parties, where he lost to Republican George L. Sheldon.

[5] He lost an attempt at a second term in 1910, losing in the Democratic primary to James Charles Dahlman.