Thracians or Thracian Bulgarians (Bulgarian: Тракийски българи or Тракийци) are a regional, ethnographic group of ethnic Bulgarians, inhabiting or native to Thrace. Today, the larger part of this population is concentrated in Northern Thrace, but much is spread across the whole of Bulgaria and the diaspora. Until the beginning of the twentieth century the Thracian Bulgarians lived also in the whole of Thrace, then part of the Ottoman Empire. After the persecutions during the Preobrazhenie Uprising and the ethnic cleansing, caused to the Bulgarian population in Eastern Thrace after the Second Balkan War, these people were expelled from the area. After World War I, Bulgaria was required to cede Western Thrace to Greece. A whole population of Bulgarians in Western Thrace was expelled into Bulgaria-controlled Northern Thrace. This was followed by a further population exchange which radically changed the demographics of the region toward increased ethnic homogenization within the territories each respective country ultimately was awarded. At this period the Bulgarian Communist Party was compelled by Comintern to accept the formation of a new Thracian nation on the base of this people in order to include them in a new separate Thracian state, as a part of a future Balkan Communist Federation.
The last flow of Thracian refugees into Bulgaria was as the Bulgarian Army pulled out of the Serres-Drama region in late 1944.
^The Thracian and His World. Proceedings of the eighth National Conference of Bulgarian Ethnologists, Haskovo 1995. Sofia, 1 Publication: ETHNOLOGIA BULGARICA. Yearbook of Bulgarian Ethnology and Folklore (2/2001), Stamenova, Jivka; Language: English Subject: Anthropology, Issue: 2/2001, Page Range: 141-143
^Groups of Bulgarian population and ethnographic groups, Bulgarian Ethnology (March 1987), Simeonova, Gatya; Language: Bulgarian, Subject: Anthropology, Issue: 3/1987, Page Range: 55-63.
^V, Joseph. The Communist Party of Bulgaria; Origins and Development, 1883-1936. Columbia University Press. p. 126.
^Migrattsionni protsesi v Bŭlgariiia sled Vtorata svetovna voina, Boika Vasileva, Univ. izd-vo "Sv. Kliment Okhridski", 1991, str. 138-146.