Syntagmatarchis (Greek:Συνταγματάρχης; abbreviatedΣχης), sometimes anglicised asSyntagmatarch, is used in modern Greek to denote the rank ofcolonel. It is translated as "leader of a regiment (syntagma)", and dates back to the Classical Age armies. However, the name is misleading in that the Hellenic Army retains very few regiments in its command structure. Thus, the typical responsibilities ofSyntagmatarches are in staff positions, or as executive officers in brigades. Officers holding this rank should be addressed asKyrie Syntagmatarcha (Κύριε Συνταγματάρχα).

Syntagmatarchis Συνταγματάρχης
Rank insignia
Country	Greece
Service branch	Hellenic Army Hellenic Gendarmerie (till 1984)
Abbreviation	Σχης
NATOrank code	OF-5
Next higher rank	Taxiarchos
Next lower rank	Antisyntagmatarchis

In the modernHellenic Army the rank is superior to anAntisyntagmatarchis (Lieutenant Colonel) and inferior to aTaxiarchos (Brigadier). The insignia consists of a flaming grenade and three golden stars.

TheGreek junta, amilitary dictatorship which ruled the country from 1967 until 1974, is also known as "The Regime of the Colonels" because most of its chief leaders were of Colonel rank, including two of the three chief leaders,George Papadopoulos andNikolaos Makarezos.

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  Rank insignia of aSyntagmatarchis, 1908–1936
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  Rank insignia of aSyntagmatarchis, 1937–1970
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  Rank insignia of aSyntagmatarchis, 1970–1973
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  Current rank insignia of aSyntagmatarchis, since 1975