The Bulgarian monarchy was abolished in 1946. The last reigning monarch was HM Tsar Simeon II of Bulgaria, who is now the currect head of the Bulgarian Royal Family. The law of succession of the family is agnatic primogeniture. Thus therefore, only males can succeed Simeon II, leading to the theoretical order of succession to the Bulgarian throne:

1. HRH Kardam, Prince of Turnovo, Duke of Saxony
   Kardam, Prince of Turnovo
   Kardam, Prince of Turnovo, Duke of Saxony , is the eldest son of Tsar Simeon II of Bulgaria and his wife Doña Margarita Gómez-Acebo y Cejuela, however born after his loss of the throne. As such, he is by courtesy also sometimes styled as if being a crown prince...
   
   (born 2 December 1962)
2. HRH Prince Boris of Bulgaria, Duke of Saxony
   Prince Boris of Bulgaria
   Prince Boris Turnovski of Bulgaria, Duke of Saxony is the first son of Kardam, Prince of Turnovo and a grandson of Simeon II of Bulgaria, former Tsar of Bulgaria. He is thus second in line to the titular throne of Bulgaria....
   
    (born 10 October 1997)
3. HRH Prince Beltran of Bulgaria, Duke of Saxony (born 23 March 1999)
4. HRH Kyril, Prince of Preslav, Duke of Saxony (born 11 July 1964)
5. HRH Prince Tassilo of Bulgaria, Duke of Saxony (born 20 January 2002)
6. HRH Kubrat, Prince of Panagyurishte, Duke of Saxony (born 5 November 1965)
7. HRH Prince Mirko of Bulgaria, Duke of Saxony (born 26 April 1995)
8. HRH Prince Lukás of Bulgaria, Duke of Saxony (born 15 July 1997)
9. HRH Prince Tirso of Bulgaria, Duke of Saxony (born 3 June 2002)
10. HRH Konstantin-Assen, Prince of Vidin, Duke of Saxony
    Konstantin-Assen, Prince of Vidin
    Konstantin-Assen, Prince of Vidin, Duke of Saxony , is the fourth son of Tsar Simeon II of Bulgaria and his wife Doña Margarita Gómez-Acebo y Cejuela. He is known also as Konstantin-Assen of Bulgaria and Konstantin-Assen of Vidin, the latter being the title of the fourth son of Bulgarian kings...
    
     (born 5 December 1967)
11. HRH Prince Umberto of Bulgaria, Duke of Saxony (born 20 November 1999)