The Great Mosque of Fes el-Jdid is the historic main Friday mosque of Fes el-Jdid, the royal city and Marinid-era citadel of Fez, Morocco. It is believed to have been founded in 1276, around the same time that the city itself was founded, making it the oldest mosque in Fes el-Jdid. It was likely redecorated at a later period. The mosque follows the usual layout of North African mosques with a hypostyle prayer hall, internal courtyard, and ornate minaret. Its annexes include a mausoleum containing several tombs, one of which is commonly believed to be that of Sultan Abu Inan, although this is not confirmed by any inscriptions.