Masajiro OZEKI (1844 ? - February 28, 1892) was a Shirabeyaku ken Kansatsu (Shinsengumi's organizational post for investigating movements of the opponents and keeping the Shinsengumi members under control) of the Shinsengumi (a special force that guarded Kyoto during the end of Tokugawa Shogunate).
尾関雅次郎（おぜきまさじろう、天保15年（1844年）？-明治25年（1892年）2月28日）は新選組調役兼監察。