Inaba Masaaki (稲葉 正明, 1723 – September 9, 1793) was daimyō of Tateyama Domain during late-Edo period Japan.
In August 1737, he became a page to Shōgun Tokugawa Ieharu, and received Lower 5th Court Rank and the courtesy title of Etchu-no-kami .
This last grant qualified him for the status of daimyō, and he was allowed to revive Tateyama Domain in Awa Province, which had been dormant since the fall of the Satomi clan in 1614.
He retired from public life on July 8, 1789, turning Tateyama Domain over to his 4th son, Inaba Masatake.
Inaba Masaaki was married to a daughter of Toda Ujifusa, daimyō of Ogaki-Shinden Domain in Mino Province.