Miyoshi Masanaga (三好 政長, 1508 – July 18, 1549) was a Japanese samurai of the Sengoku period, a member of the Miyoshi clan who served as Hosokawa Harumoto.^[1] He is remembered as the cousin of Miyoshi Nagayoshi. Masanaga had very strong relations with the Ikeda clan, as Ikeda Nagamasa was his son-in-law. Due to this strong relation between the families, Chokei considered him a threat. After 1548, Masanaga engaged in a major battle against his cousin, which ended in Chokei's victory. Masanaga's whereabouts after this battle are unknown.^[2]