Inohana Castle was a Japanese hirayama-style castle located in Inohana in the Chuo district of Chiba City, Chiba Prefecture. It is commonly known as Chiba Castle. The surrounding area of the castle ruins have been developed into Inohana Park. The castle ruins, including its earthworks and moats, have been designated as a cultural property of the city. The Chiba City Folk Museum, a Japanese castle replica, was built on the site in 1967.