was a daimyà  and official of the Tokugawa shogunate during late-Edo period in Japan. His courtesy title was Kawachi-no-kami.
Inoue Masaharu was the eldest son of the disgraced former daimyà  of Hamamatsu, Inoue Masamoto, who had been demoted to Tanagura Domain in Mutsu Province. He inherited the leadership of the Inoue clan and the position of daimyà  of Tanakura Domain on his father's death in 1820.
In 1820, Masaharu was appointed to the office of Sà Âshaban (Master of Ceremonies), and in 1834 to that of Jisha-bugyà Â. In 1836, he was transferred to the Tatebayashi Domain (60,000 koku) in the Kà Âzuke Province. In 1838, he was appointed Osaka-jà  dai (Castellan of Osaka), and in 1840, he ascended to the rank of Rà Âjà « (Senior Councilor) in the service of Shà Âgun Tokugawa Ieyoshi.
In 1845, with the resignation of head Rà Âjà « Mizuno Tadakuni over the failure of the Tenpà  Reforms and subsequent exile from the Hamamatsu Domain to the Yamagata Domain in the Dewa Province, Inoue Masaharu was able to achieve the Inoue clan's goal of returning to Hamamatsu after an absence of 28 years. From his years in Tanakura in Mutsu, Masaharu brought back a considerable body of knowledge on cotton production and artisans to build new looms, thus developing a major new industry for Hamamatsu and a source of income for the domain. He died in 1847, only two years after the return of the clan to Hamamatsu, and his grave is at the clan temple of Jà Âshin-ji in Mukogaoka, Bunkyà Â, Tokyo
Masaharu was married to a daughter of Abe Masakiyo, daimyà  of Fukuyama Domain. He was succeeded by his fourth son, Inoue Masanao. One of his daughters was the formal wife of Mizuno Tadakiyo, the son and heir of Mizuno Tadakuno.
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