Katsuyama Domain (勝山藩, Katuyama-han) was a feudal domain under the Tokugawa shogunate of Edo period Japan, located in Mimasaka Province in what is now the northern portion of modern-day Okayama Prefecture.

It was centered around Katsuyama Castle which was located in what is now the city of Maniwa, Okayama and was controlled by a cadet branch tozama daimyō Miura clan throughout all of its history.

[1][2][3] It was initially known as Takada Domain (高田藩) after the original name of Katsuyama Castle, and in the late Bakumatsu period it was renamed Mashima Domain (真島藩) after its location in Mashima County.

The 9th daimyō, Miura Hirotsugu, supported the shogunate in the Bakumatsu period, but his son, and final daimyō, Miura Takatsugu supported the imperial cause and the clan was later ennobled with the kazoku peerage title of shishaku (viscount).

As with most domains in the han system, Katsuyama Domain consisted of several discontinuous territories calculated to provide the assigned kokudaka, based on periodic cadastral surveys and projected agricultural yields.