Abu Nasr Sa'd (1398–1465) was the twentieth Nasrid ruler of the Emirate of Granada on the Iberian Peninsula. He was known by the regnal name al-Musta'in bi-llah and as Ciriza or Mulay Zad to contemporary Christian chroniclers.
- Occupation
- politician
- Position held
- sultan of Granada
- Born
- 1398, 1399
- Died
- 1465
