William Walter Clark (July 7, 1885 – May 15, 1971) was an American educator, farmer, and Republican politician.

He represented Wood County in the Wisconsin State Assembly for fourteen years, and was twice elected to the Wisconsin State Senate from the 24th Senate district.

Clark was born on July 7, 1885, in Plum City, Wisconsin.

Clark then went on to serve in the Senate from the 24th district from 1953 to 1960, at which time he was succeeded by John M. Potter.

Additionally, he was Chairman of Hansen, Wisconsin, and of the Wood County Board.