William Frederick Sapp (August 30, 1856 – March 8, 1917) was an unsuccessful Democratic party candidate for the state of Kansas in the United States House of Representatives elections of 1894.

He was a member of Democratic National Committee from Kansas.

[1] He was born on August 30, 1856, in Grand Rapids, Michigan, to Rezin Sapp and Margaret E.

He married Mary E. Wood on October 29, 1885, in Quincy, Illinois.

He was a member of Democratic National Committee from Kansas in 1912.