Doku Khamatovich Umarov, also known as Dokka Umarov as well as by his Arabized name of Dokka Abu Umar, was a Chechen mujahid in North Caucasus. Umarov was a major military figure in both wars in Chechnya during the 1990s and 2000s, before becoming the leader of the greater insurgency in the North Caucasus. He was active mostly in south-western Chechnya, near and across the borders with Ingushetia and Georgia.

Mujahideen, or Mujahidin, is the plural form of mujahid, an Arabic term that broadly refers to people who engage in jihad, interpreted in a jurisprudence of Islam as the fight on behalf of God, religion or the community (ummah).