|Official language(s)||English, Greek|
|Recognised languages||Ancient Greek, Tsakonian|
|- King||Konstantinos I|
Themistocleia (Greek: Θεμιστόκλεια), officially the Kingdom of Themistocleia (Greek: Βασίλειο της Θεμιστοκλείας) is a sovereign, self-governing entity, commonly referred to as a micronation. Founded on 32 Marcuary 1420, Themistocleia claims XX area near Thessaloniki, Greece. Themistocleia is an absolute monarchy led by King Konstantinos I.