Küçük Mustafa ("Mustafa the Small" or "Mustafa the Little" or "Mustafa the Young"; c. 1409 – 1422) was an Ottoman prince (Turkish: şehzade) who fought to gain control of the throne of the Ottoman Empire in 1422. It was used by the Ottoman chroniclers to distinguish him from his uncle Mustafa Çelebi, who also rebelled against the throne.