Umar ibn al-Khattab (; ), simply known as Umar, was the second Rashidun caliph, ruling from August 634 until his assassination in 644. He succeeded Abu Bakr and is regarded as a senior companion and father-in-law of the Islamic prophet Muhammad.

The conversion of Umar ibn al-Khattab to Islam is presented in Sunni Islam as a highly dramatic, epic, and prototypical