Yusuf I, Sultan of Granada (June 29, 1318 – October 19, 1354) was the seventh Nasrid ruler of the Emirate of Granada in Al-Andalus on the Iberian Peninsula. He was Sultan between 1333 and 1354.
Yusuf I was assassinated whilst praying in a mosque in Granada at the age of thirty-six. On October 19, 1354, a maniac rushed suddenly from behind and plunged a dagger in his chest. The cries of the king brought his guards and courtiers to his assistance. They found him weltering in his blood. He made some signs as if to speak, but his words were unintelligible. They bore him senseless to the royal apartments, where he died almost immediately. His eldest son, Muhammed V succeeded him at the age of sixteen.