Najm al-Dīn 'Alī ibn 'Umar al-Qazwīnī al-Kātibī (Persian: نجمالدین القزوینی الکاتبی; born AH 600 / 1204 CE, died AH 675 / 1276 CE) was a Persian Islamic philosopher and logician of the Shafi`i school.
[1] His most important works are a treatise on logic, Al-Risala al-Shamsiyya, and one on metaphysics and the natural sciences, Hikmat al-'Ain.
[2] Further, he helped to establish the Maragha observatory along with Nasir al-Din al-Tusi and several other astronomers.
[4] Al-Katibi's other major work, Philosophy of the Source, is a treatise about physics and metaphysics.
[5] Under the title The Rules of Logic, a bilingual Arabic edition and English translation of this text was published in 2024 by the Library of Arabic Literature, edited and translated by Tony Street of the Faculty of Divinity at the University of Cambridge.