Form of government - parliamentary (BG;EN)
Supreme source of law - The Constitution (BG); The Constitution (unwritten) (EN)
Fundamental principles - political plurality, free economic initiative, equality before the law (BG); parliamentary sovereignty and rule of law (EN)
Head of state - President (BG); Elizabeth II, Queen of the United Kingdom of Great Britain and Northern Ireland (EN)
Principal legislative authority - National Assembly (BG); Parliament (EN)
Principle executive authority - Council of Ministers (BG); Prime Minister and the Cabinet (EN)
Principle judicial authority - the Judiciary (BG); the Supreme court of the United Kingdom (EN)
Administrative subdivision - municipalities (BG); four home nations and further subdivision (EN)