William Williamson (October 7, 1875 – July 15, 1972) was a U. S. Representative from South Dakota. He was the last Representative from the third district.
William Williamson was born near New Sharon in Mahaska County, Iowa. In 1882, he moved with his parents to Plankinton, Aurora County, South Dakota.
| United States House of Representatives | ||
|---|---|---|
| Preceded by Harry L. Gandy |
United States Representative (3rd District) for South Dakota 1921–1933 |
Succeeded by none |