Abū ʿAlī al-Ḥusayn ibn ʿAbd Allāh ibn Sīnā (Persian: "son of Sina"; c. 980 – 1037), commonly known as Ibn Sīnā or by his Latinized name Avicenna, is a Persian polymath, who writes almost 450 treatises on a wide range of subjects, of which around 240 have survived.

In particular, 150 of his surviving treatises concentrate on philosophy and 40 of them concentrate on medicine.

His most famous works are The Book of Healing, a vast philosophical and scientific encyclopaedia, and The Canon of Medicine, which is a standard medical text at many medieval universities.

The Canon of Medicine is used as a textbook in the universities of Montpellier and Leuven as late as 1650.

Ibn Sīnā's Canon of Medicine provides a complete system of medicine according to the principles of Galen (and Hippocrates).

His corpus also includes writing on philosophy, astronomy, alchemy, geology, psychology, Islamic theology, logic, mathematics, physics, as well as poetry.

He is regarded as the most famous and influential polymath of the Islamic Golden Age.