The United Panhellenic Organization of Youth, abbreviated EPON (Greek: ()), was a Greek resistance organization

that was active during the Axis Occupation of Greece in World War II. EPON was the youth wing of the National Liberation Front (EAM) organization, and was established on 23 February 1943 after the merger of ten earlier political and resistance youth organizations. Along with EAM and its other affiliates, EPON was dissolved judicially at the beginning of the Greek Civil War but continued to operate illegally until 1958.

The Greek resistance (Greek: Εθνική Αντίσταση, romanized: Ethnikí Antístasi, "National Resistance"), involved armed and unarmed groups from across the political spectrum that resisted the Axis occupation of Greece in the period 1941–1944, during World War II. The largest group was the Communist-dominated EAM-ELAS. The Greek Resistance is considered one of the strongest resistance movements in Nazi-occupied Europe, with partisans, known as andartes, controlling much of the countryside prior to the German withdrawal from Greece in late 1944.