Nabeshima Naomasa (鍋島 直正, January 16, 1815 – March 8, 1871) was the 10th and final daimyō of Saga Domain in Hizen Province, Kyūshū, Japan.

In celebration of his new role and to reinforce the close relations between Saga domain and the shogunate, his father-in-law Shōgun Tokugawa Ienari allowed him the use of one character from his name.

Through his contacts at nearby Nagasaki, he imported Armstrong cannon, far more powerful than anything deployed by the Tokugawa shogunate to date, and had the weapons reverse engineered with copies made by Saga armories.

In 1853, with the arrival of Commodore Matthew Perry to end Japan’s national isolation policy, he was initially vocal in his support of the Sonnō jōi faction, and assisted the Tokugawa government in building coastal defense batteries around Edo Bay.

Even after retirement, he kept an active hand in the development of Saga Domain, strongly supporting rangaku studies, especially in the fields of western medicine, weaponry and military tactics.

Together with Shimazu Yoshitake, he was appointed Commissioner of Colonial Affairs, and tasked with the settlement of Ezo and other lands in northern Japan.