Aris Velouchiotis (Greek name: Άρης Βελουχιώτης - real name: Thanasis Klaras - Θανάσης Κλάρας, Lamia, 27 August 1905 – Mesounta Arta, 16 June 1945) was a Greek journalist, politician, KKE member and leader of ELAS, the largest resistance organization in Greece during the Occupation. He was born in Lamia to a wealthy family.

He studied agronomy at the Averofia Middle Agricultural School of Larissa, but soon abandoned his profession and moved to Athens. There he was initiated into communist ideology and in 1924 became a member of the Federation of Communist Youth of Greece. During his military service he was sent to the Disciplinary Ulama of Kalpaki.