Numa Morikazu (沼間 守一, 2 December 1843 – 17 May 1890) was a politician and journalist in Meiji period Japan.

He learned English from James Curtis Hepburn in Yokohama, and was later sent to study western military science at Nagasaki.

He translated a text on English-style infantry warfare in 1866 and, in 1867, he was commissioned as a hohei-gashira nami (歩兵頭並; roughly equivalent to a lieutenant) in the Shogunate's elite Denshūtai unit.

Reorganizing it into the Tōkyō-Yokohama Mainichi Shinbun, he used it as a mouthpiece for the liberal ideas he always supported, and used it to call for the establishment of a national assembly.

In 1881, he prepared the foundation of Liberal Party with Itagaki Taisuke but joined the Rikken Kaishintō with Ōkuma Shigenobu following year.