Clarence K. Nishihara (born 1942 or 1943) was a Democratic member of the Hawaii Senate, representing the state's 18th district from 2004 to 2022.

He was the Chair of the Committee on Public Safety, Intergovernmental and Military Affairs.

[2] On May 5, 2022, Nishihara announced his retirement after 18 years in the Legislature.

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