Clarence K. Nishihara
Nishihara in 2009
Member of the Hawaii Senate from the 17th district
In office January 16, 2013 – January 16, 2023
Preceded by	Michelle Kidani
Succeeded by	Henry Aquino
Member of the Hawaii Senate from the 18th district
In office 2004–2013
Preceded by	Cal Kawamoto
Succeeded by	Michelle Kidani
Personal details
Born	1942 or 1943 (age 80–81)[1] Makawao, Hawaii
Political party	Democratic

Clarence K. Nishihara is a Democratic member of the Hawaii Senate, representing the state's 18th district from 2004 to 2023. He was the Chair of the Committee on Public Safety, Intergovernmental and Military Affairs.^[2]

Nishihara announced at the end of the 2022 legislative session that he would be retiring from the Legislature, and would not run in the 2022 Hawaii Senate election.^{[3][needs update]}