Ronald T. Y. Moon (September 4, 1940 – July 4, 2022) was the Chief Justice of the Hawaii State Supreme Court in Honolulu, Hawaii. He served his first term from 1993 to 2003, and his second term from 2003 until retiring in August 2010. Moon studied at Coe College towards bachelor's degrees in psychology and sociology. He went on to the University of Iowa College of Law, where he obtained his Juris Doctor. He returned to Honolulu in 1965 and became law clerk to United States District Court Judge Martin Pence. He served under Pence for a year. In 1966, Moon joined the staff of the Prosecuting Attorney of Honolulu where he was deputy prosecutor until 1968. He left public service to become a partner in the law firm Libkuman, Ventura, Moon and Ayabe where he stayed until 1982. It was from the la