Key Hunter (キイハンター, Kī Hantā?) was a prime-time television detective series in Japan. It aired on Saturday nights in the 9:00–9:56 p.m. time slot on the Tokyo Broadcasting System (TBS) network from April 6, 1968 to April 7, 1973. There were a total of 262 episodes, and it was one of the most popular action dramas in Japan at the time.
The story involved "Key Hunter", a special clandestine unit of the International Police, which endeavored to solve various crimes. 『キイハンター』は、1968年（昭和43年）4月6日から1973年（昭和48年）4月7日までTBS系列で、毎週土曜日21：00～21：56（後期は21：55）に放送された、昭和40年代を代表する人気アクションドラマである。全262話。
映像上、タイトルは「KEY HUNTER」と英字で表記されることも多い。
The theme music Hijō no License was written by Shunsuke Kikuchi, played as an instrumental for the opening theme, and sung by Yōko Nogiwa for the ending theme.
