Nasir Mamman GCON (2 July 1929[1] – 13 April 2019), titled Galadiman Katsina from 1992 to 2019, was a Nigerian jurist and nobleman who served as President of the Courts of Appeal from 1978 to 1992.

Mamman, Mohammed Bello, and Justice Buba Ardo went on to become the first northerners educated in the common law to be in-government since the fall of the Sokoto Caliphate.

[4][5] On his return, he was made Crown Counsel in 1956 and proceeded on for the next two decades to hold several positions in the Government of Northern Nigeria in which he dealt with most of the legal matters.

He reluctantly agreed to return in 1967 on noticing a dearth of experts of the law as Attorney General of North Central State Government.

He retired from the bench at the age of 49, and self-effacingly became President of the Courts of Appeal[6] until his ennoblement on May 9, 1992, as the Galadima of Katsina and District Head of Malumfashi.