Sassa Narimasa (佐々 成政, February 6, 1536 – July 7, 1588), also known as Kura-no-suke (内蔵助), was a Japanese samurai of the Sengoku through Azuchi–Momoyama period. Narimasa was born in what is now Nishi-ku, Nagoya (situated in contemporary Aichi District, Owari Province). He became a retainer of Oda Nobunaga in 1550 and was granted Etchū Province as a reward for helping Shibata Katsuie fight the Uesugi clan.
He participated in the 1577 Battle of Tedorigawa and defended Toyama Castle against Kawada Nagayori in the 1581 Battle of Arakawa. He and Shibata Katsuie successfully laid siege to Uozu in 1582. After Nobunaga's death, in 1584 he joined Tokugawa Ieyasu in unsuccessfully challenging Toyotomi Hideyoshi. He submitted to Hideyoshi and his life was spared. In 1587, he was given a fief in Higo Province in Kyushu. However, due to difficulties in suppressing a local revolt, he committed suicide (seppuku) by Hideyoshi's instruction in 1588. His daughter married kuge Takatsukasa Nobufusa and they had a son Nobuhisa.
- Father: Sassa Morimasa
- Sassa Magosuke (distinguished as one of the Seven Spears of Azukizaka. Died in Battle of Inabugahara against Oda Nobuyuki; 1556)
- Sassa "Hayato no Kami" Masatsugu (distinguished as one of the Seven Spears of Azukizaka. Died in battle of Okehazama; 1560)
- Wife: Haruhime later Jiko-in
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