Inaba Masami (稲葉 正巳, November 15, 1815 – September 16, 1879) was daimyō of Tateyama Domain during late-Edo period Japan.

He resigned the title in 1864, with instructions to strengthen Japan's naval defenses against the increasing aggressive incursions of foreign black ships, and supported Katsu Kaishū’s efforts to create the Kobe Naval Training Center.

He was reappointed as a Wakadoshiyori in 1865, and rose to the positions of Rōjū, Commissioner of the Army and Fleet Admiral of the Tokugawa Navy under Shōgun Tokugawa Yoshinobu.

However, with the start of the Boshin War, he refused to take an active role against the Satchō Alliance and went into retirement at Tateyama Castle, turning the domain over to his son Inaba Masayoshi.

Inaba Masami was married to a daughter of Suwa Tadamichi, daimyō of Suwa Domain in Shinano Province.