The IV Army Corps "Thrace" (Greek: Δ΄ Σώμα Στρατού «Θράκη», abbr. Δ΄ ΣΣ) is an army corps of the Hellenic Army. Established before the First World War, it served in all conflicts Greece participated in until the German invasion of Greece in 1941. Re-established in 1976, it has been guarding the Greco-Turkish land border along the Evros River, and is the most powerful formation in the Hellenic Army.