Moriyama Domain (守山藩, Moriyama-han) was a feudal domain under the Tokugawa shogunate of Edo period Japan, located in southern Mutsu Province in what is now part of the modern-day city of Kōriyama, Fukushima. It was established by a cadet branch of the Tokugawa clan of Mito. A relatively small domain, it had a kokudaka of 20,000 koku.

In 1661, Matsudaira Yorifusa of Mito Domain created Nukada Domain, 20,000 koku subsidiary holding for his fourth son, Matsudaira Yorimoto in what is now part of the city of Naka, Ibaraki. He ruled Nukata until his death in 1693, and was succeeded by his son, Matsudaira Yorisada. By order of Shōgun Tokugawa Tsunayoshi, Yorisada was granted a fief of 20,000 koku in Moriyama in Tamura District in Mutsu Province in 1700. His original holdings reverted to Mito Domain. Although the daimyō of Moriyama were not subject to sankin-kōtai since they were direct relatives of the ruling Tokugawa, they preferred to reside permanently at the clan's Edo residence in Koishikawa and to leave administration of the domain in the hands of overseers appointed by the parent house at Mito Domain. During the Bakumatsu period, many of the samurai of Moriyama supported the Mito Rebellion of 1864, and the clan was punished by the shogunate. When the forces of the anti-Tokugawa Satchō Alliance advanced north during the Boshin War, the domain surrendered without a fight.

Following the Meiji restoration, the seat was of the domain was transferred to what is now Ōarai, Ibaraki and it was briefly renamed Matsukawa Domain from 1868 until the abolition of the han system in 1871. Matsudaira Yoriyuki, the last daimyō of Moriyama, was succeeded by Matsudaira Nobunori, the adopted former lord of Aizu who had cut his familial ties to Matsudaira Katamori as imperial governor of Matsukawa..

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

Matsudaira Yorimoto (松平頼元; September 1, 1629 - June 1, 1693) was the 1st daimyō of Nukada Domain in Hitachi Province. He was the fourth son of Tokugawa Narifusa of Mito Domain and was thus a grandson of Shōgun Tokugawa Ieyasu. His elder brother was the Mito Mitsukuni. who created the 20,000 koku domain for him in 1661. He was a noted waka poet and master of the Japanese tea ceremony. His wife was a daughter of Ogasawara Tadazane. He died in 1693.

Matsudaira Yorisada (松平頼貞; February 21, 1664 - September 9, 1744) was the 2nd and final daimyō of Nukada Domain in Hitachi Province and the 1st daimyō of Moriyama Domain in Mutsu Province. He was the eldest son of Matsudaira Yorimoto. He became daimyō of Nukada on his father's death in 1693. In 1700, he moved his seat to Moriyama. He retired in 1743 and died in 1744.

Matsudaira Yorihiro (松平頼寛; March 23, 1703 - December 2, 1763) was the 2nd daimyō of Moriyama Domain. He was the third son of Matsudaira Yorisada. He became daimyō on the retirement of his father in 1738. His wife was a daughter of Matsudaiara Yoritaka of Takasu Domain. To improve the domain's finances, he ordered the planting of 500,000 Chinese lacquer trees throughout the domain. He was a disciple of the noted Confucianism scholar Ogyū Sorai and built a han school to propagate his teachings. he was later called upon for advice in reforming the finances of Mito Domain. He died in 1763.

Matsudaira Yoriakira (松平頼亮; May 18, 1744 - October 15, 1801) was the 3rd daimyō of Moriyama Domain. He was the third son of Matsudaira Yorihiro. He became daimyō on the death of his father in 1763. He implemented a number of fiscal reform measures, including laws to prevent peasants from doing to other domains even on a temporary basis, and cracking down on gambling and prostitution.