Muslim Atayev (June 24, 1973 – January 27, 2005), also known as Emir Sayfullah, was the founder of the militant organization Yarmuk Jamaat, which later became part of the Caucasus Front's Kabardino-Balkarian Sector in the Russian-held Caucasian Muslim state Kabardino-Balkaria of the Second Chechen War.
Atayev was an ethnic Balkar and started his military career as a volunteer fighting in Chechnya.