主権国家体制（しゅけんこっかたいせい、（羅: civitas sui iuris）とは、中世における普遍的世界の崩壊に伴って16世紀 - 18世紀のヨーロッパで形成された国家のあり方と世界秩序のことである。.
A people permanently occupying a fixed territory bound together by common law, habits and custom into one body politic exercising, through the medium of an organized government, independent sovereignty and control over all persons and things within its boundaries, unless or until authority is ceded to a federation or union of other states.