William Preston Graves (born January 9, 1953) is an American former politician who was the 43rd governor of Kansas from 1995 until 2003.

After graduating from Kansas Wesleyan University with a business degree, he worked in human resources.

He defeated Democratic Congressman Jim Slattery in the Republican sweeping elections of 1994 at the age of 41.

Graves was barred from running for a third term as governor by Kansas state law, and was succeeded by Democrat Kathleen Sebelius in January 2003.

Serving with him as lieutenant governor were Sheila Frahm (1995–1996), whom he appointed to fill Bob Dole's seat in the Senate, and Gary Sherrer (1996–2003).