Alhaji Sir Usman Nagogo dan Muhammadu Dikko KBE CMG (1905 – 18 March 1981) was Emir of Katsina (Sarkin Katsina) from 19 May 1944, until his death. A Fulani from the Sullubawa Clan, he succeeded his father, Muhammadu Dikko, as Emir, and was succeeded by his son, Muhammadu Kabir Usman.