Sheikh Mahdi Al-Khalissi, also known as Mohammad Mahdi Al-Khalissi and Mahdi Al-Khalisi, (died 1925) was a prominent religious leader in Iraq during the British period of the early 20th century. At the time he was the Supreme Marja (Shia scholar and spiritual leader) in Iraq.[1][2] He was also a professor and the head of the College of Divinity at Kadhimiya, Baghdad, Iraq.[3][4]