Honda Masazumi (本多 正純) (1566 – April 5, 1637) was a Japanesesamurai of theAzuchi–Momoyama period through earlyEdo period, who served theTokugawa clan. He later became adaimyō, and one of the firstrōjū of theTokugawa shogunate.

Masazumi was born in 1565; he was the eldest son ofHonda Masanobu. Father and son servedTokugawa Ieyasu together. Masazumi was in the main force at Sekigahara; after the battle, Masazumi was entrusted with the guardianship of the defeatedIshida Mitsunari. Masazumi was made a daimyo in 1608, with an income of 33,000koku.

Ieyasu trusted Honda sufficiently to have relied on him as an intermediary for diplomatic initiatives with China.^[1]

Later, Masazumi served at thesiege of Osaka; in 1616, he became atoshiyori; this was the position that would soon after be renamed asrōjū. In this role, he worked closely with the now-retired second shōgun,Hidetada. During this period, his income was increased to 53,000koku, then to 155,000 in 1619. However, in 1622 he fought withKamehime (Ieyasu's first daughter), fell into disfavor with Hidetada, and was exiled to Yokote, in theKubota Domain. Masazumi died in Yokote in 1637 at age 73.

• (in Japanese)"Honda Masazumi no retsuden" (22 February 2008)
• Mizuno, Norihito. (2003).China in Tokugawa Foreign Relations: The Tokugawa Bakufu’s Perception of and Attitudes toward Ming-Qing China, p. 109. excerpt fromJapan and Its East Asian Neighbors: Japan's Perception of China and Korea and the Making of Foreign Policy from the Seventeenth to the Nineteenth Century, Ph.D. dissertation, Ohio State University, 2004, as cited in Tsutsui, William M. (2009).A Companion to Japanese History, p. 83.

• (in Japanese)Images of correspondence by Honda Masazumi

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