Sadid al-Din Muhammad ibn Mas‘ud al-Kazaruni was a 14th-century Persian physician from Kazerun, Fars, Iran. He was a popular commentator on earlier medical writings, and composed a commentary titled al-Mughni fi sharh al-Mujiz on the epitome of The Canon of Medicine by Avicenna. Numerous copies of this popular commentary are preserved today, including at the National Library of Medicine. He died in 1357.