Karatsu Castle (唐津城 Karatsu-jō) is a Japanese castle located in Karatsu, Saga Prefecture, Japan. It is a hirayamajiro, a castle built on a plain rather than a hill or mountain. At the end of the Edo period, Karatsu castle was home to the Ogasawara clan, daimyō of Karatsu Domain. It was also known as "Dancing Crane Castle" (舞鶴城 Maizuru-jō).