Crystal King is a Japanese rock and kayōkyoku band. They gained commercial success with their debut single "Daitokai" (大都会?) which sold 1.5 million copies, and are remembered in Japan for their performance of the first theme songs of Fist of the North Star: "Ai o Torimodose!!" and "Yuria... Eien ni".

The band was formed by Musshu Yoshizaki in 1971, who was joined by a second vocalist, Masayuki Tanaka, in 1975. Other musicians to have played with the band include Yamashita Michio on guitar and Nomoto Hidetoshi on bass. They made their major label debut in 1980.

Originally consisting of vocalists Monsieur Yoshisaki (ムッシュ吉崎 Musshu Yoshisaki?) and Masayuki Tanaka, guitarist Michio Yamashita (山下 三智夫 Yamashita Michio?), pianist Kimiharu Namakura (中村 公晴 Nakamura Kimiharu?), keyboardist Hiromi Imakiire (今給黎 博美 Imakiire Hiromi?), drummer Ken Kanefuku (金福 健 Kanefuku Ken?), and bassist Hidetoshi Nomoto (野元 英俊 Nomoto Hidetoshi?), the band broke up in 1995 and beginning in 2004, Yoshisaki began performing as Crystal King as a solo project. Tanaka began his own solo career, severely damaging his voice in 1989. The rest of the band performs as Cross Road (クロスロード Kurosu Rōdo?), reuniting with Tanaka on occasion.