This list is of the Historic Sites of Japan located within the Prefecture of Okayama.
As of 6 August 2019, forty-seven Sites have been designated as being of national significance (including one *Special Historic Site); the Joseon Mission Sites includes sites in Hiroshima and Shizuoka Prefectures.
As of 6 August 2019, sixty Sites have been designated as being of prefectural importance.
As of 1 May 2018, a further four hundred and sixty-two Sites have been designated as being of municipal importance.