William Purnell Lambertson (March 23, 1880 – October 26, 1957) was a U.S. Representative from Kansas.

Born in Fairview, Kansas, Lambertson attended the public schools, Ottawa (Kansas) University, and the law school of the University of Chicago, Chicago, Illinois.

He served as chairman of Kansas State Efficiency and Economy Commission in 1917.

Lambertson was elected as a Republican to the Seventy-first and to the seven succeeding Congresses (March 4, 1929 – January 3, 1945).

This article incorporates public domain material from the Biographical Directory of the United States Congress