Lifespan: Meiō 2 (1493) to Tenbun 10 (1541)
Father: Nanbu Masayasu
Siblings: Yasunobu, Ishikawa Takanobu, Minami Nagayoshi, Ishigame Nobufusa, Kemanai Hidenori
Nanbu Yasunobu served as a daimyō during the Sengoku period. He was the twenty-third head of the Nanbu clan of Mutsu Province.
In 1493, Yasunobu was born as the eldest son of Nanbu Masayasu, the twenty-second head of the Nanbu clan. His next younger brother was Ishikawa Takanobu who, in turn, was the father of Nanbu Nobunao, making Takanobu his uncle. Later, Nobunao served as a sengoku daimyō and the twenty-sixth head of the Nanbu clan.
Aiming for the Nanbu to attain the status of a sengoku daimyō family, Yasunobu actively pursued policies to expand their power. In 1524, Yasunobu mobilized three of his younger brothers including Takanobu to pacify Tsugaru by taking control of assorted castles in the region. He then delegated to Takanobu the governance of Tsugaru. Similarly, he gave responsibility for the Gonohe region to his younger brother named Minami Nagayoshi, Ishigame Castle to another brother named Ishigame Nobufusa, and Kemanai Castle to his youngest brother named Kemanai Hidenori. These placements served to solidify the governance of the Nanbu clan.
In the next generation, the foundation built by Yasunobu enabled his son, Nanbu Harumasa, to continue the progress of the clan. These achievements of Yasunobu are recorded in secondary sources from later generations and there is a lack of primary sources regarding his life so uncertainty remains. For the same reason, there are many questions with respect to the nature of the Nanbu clan prior to Yasunobu.