Muhammad ibn Yahya Sibak Nishapuri (Persian: محمد بن یحیی سیبک نیشاپوری), commonly known as Fattahi Nishapuri (Persian: فتاحی نیشاپوری; "Fattahi" was his pen name; died 1448), was a Persian poet and calligrapher in the Timurid Empire. A native of the city of Nishapur, he was one of the leading poets and calligraphers at the court of the Timurid ruler Shah Rukh .