Viscount Ōzeki Masutoshi (大関 増勤, January 28, 1849 – August 9, 1905)  was the 16th (and final) daimyō of Kurobane Domain in Shimotsuke Province, Japan (modern-day Tochigi Prefecture) under the Bakumatsu period Tokugawa shogunate.
His courtesy title was Mamasaka-no-kami, and his Court rank was Junior Fifth Rank, Lower Grade, later raised to Upper Third Rank.
Viscount Ōzeki Masutoshi (大関 増勤, January 28, 1849 – August 9, 1905)  was the 16th (and final) daimyō of Kurobane Domain in Shimotsuke Province, Japan (modern-day Tochigi Prefecture) under the Bakumatsu period Tokugawa shogunate. His courtesy title was Mamasaka-no-kami, and his Court rank was Junior Fifth Rank, Lower Grade, later raised to Upper Third Rank.
Ōzeki Masunori