| Honorific Prefix: | Viscount |
| Tozawa Masazane | |
| Native Name: | 戸沢正実 40px |
| Office1: | 11th Daimyō of Shinjō Domain |
| Term Start1: | 1843 |
| Term End1: | 1869 |
| Predecessor1: | Tozawa Masayoshi |
| Successor1: | -none- |
| Office2: | Imperial Governor of Shinjō |
| Monarch2: | Emperor Meiji |
| Term Start2: | 1869 |
| Term End2: | 1871 |
| Birth Date: | 9 September 1825 |
| Death Place: | Tokyo, Japan |
| Father: | Tozawa Masayoshi |
| Spouse: |
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was the 11th (and final) daimyō of Shinjō Domain in Dewa Province, Japan (modern-day Yamagata Prefecture), under the Edo period Tokugawa shogunate of Japan. He received the courtesy title of Kazusa-no-suke which was later rated to Nakatsukasa-daiyū and Court rank of Junior Fourth Rank, Lower Grade.[1]
Tozawa Masazane was the eldest son of Tozawa Masayoshi[2] and became daimyō on his father's death in 1843. As he was still in his minority, his retired grandfather Tozawa Masatsugu initially ruled as regent in his stead. In 1846, assisted by the domain's karō Yoshitaka Kageyu, he initiated a number of political and economic reforms.[1]
During the Boshin War of the Meiji Restoration, Shinjō Domain was initially in favor of the Satchō Alliance, but later became a member of the Ōuetsu Reppan Dōmei.[1] However, after Kubota Domain switched sides to favor the Meiji government, Shinjō Domain soon followed. Neighboring Shōnai Domain, outraged by the betrayal, sent its army to invade Shinjō Domain, and after a fierce battle, destroyed Shinjō Castle and much of the surrounding castle town. Masazane escaped to Kubota Castle, where he remained in exile for 70 days until his domain was liberated by forces loyal to the new Meiji government.
On June 2, 1869, the new government awarded Shinjō Domain with an increase in revenues of 15,000 koku. However, later the same month, the government issued a decree abolishing the domain system and Masazane was appointed imperial governor of Shinjō. The former domain was absorbed into Yamagata Prefecture in July 1871 he relocated to Tokyo. In 1884, he became a viscount (shishaku) under the new kazoku peerage system. He died in 1896.[1]
Book: 歴史群像編集部 . 全国版幕末維新人物事典 . 2010 . Gakken . 978-4054044630.