Osaka Castle Park is a public urban park and historical site situated at Osaka-Jō in Chūō-ku, Osaka, Japan. It lies on the south of the Ōkawa and occupies a large area in the center of the city of Osaka. This park is the second largest park in the city. The park was constructed on a site with a long history. In the fifteenth century, a militant temple, Ishiyama Hongan-ji, was built here. In 1583, Toyotomi Hideyoshi destroyed Ishiyama Hongan-ji and built Osaka Castle here.