The Principality of Bulgaria (Bulgarian: Княжество България, Knyazhestvo Balgariya) was a de facto independent, and de jure vassal state under the suzerainty of the Ottoman Empire.
Bulgaaria vürstiriik (bulgaaria: Княжество България) oli de facto sõltumatu ja de jure vasallriik Osmanite riigi süseräniteedi all.