Walter William Stiern (March 8, 1914 – February 21, 1988) was a Democratic California State Senator representing Kern County.

Stiern attended Bakersfield College, then continued on to Washington State University where he received his Doctor of Veterinary Medicine.

He returned to Bakersfield and set up a veterinary practice catering to the local agricultural community, taking a temporary leave to serve in World War II.

Stiern was elected to the State Senate in 1958, where he advocated on education, health and agricultural issues.

Stiern became increasingly vocal during the 1960s about the fact that the junior colleges were the only segment of California public higher education which had not yet been integrated into a statewide system, and sponsored appropriate legislation to fix this.