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Muḥyi al-Dīn al-Maghribī, (Arabic,محي الدين المغربي) (c.1220 Spain – c.1283 Iran) was a Muslim astronomer and mathematician born in Spain, worked in Damascus, Syria and eventually in the Maragha observatory in Maragha, Ilkhanate of Persia, where he worked under the guidance of Nasir al-Din Tusi.

Muhyi al-Din is most known for his works in trigonometry, Book on the theorem of Menelaus, Treatise on the calculation of sines.

He is also known for his commentaries on classic Greek mathematical works, in particular, his commentary about Book XV of Elements about measurements of the regular polyhedra.