The book Das Volksthum der Slaven Makedoniens (translated as: The Ethnicity of the Slavs of Macedonia) by Karl Hron is a scholarly work published in 1890. It explores the ethnic and cultural identity of the Slavic people in the region of Macedonia. The book is considered an important contribution to German-language literature on the history and ethnography of the Balkans, particularly focusing on the Slavic populations in that area.

Hron argued that the Macedonian Slavs were a distinct ethnic group, separate from both Serbs and Bulgarians. He emphasized their unique historical and linguistic characteristics. Hron critically assessed the works of other scholars of his time, particularly those who sought to classify Macedonians as either Serbs or Bulgarians. He provided counterarguments based on his own research and observations.

Hron traced the history of the Macedonian Slavs from their settlement in the Balkans to the late 17th century. He discussed key events such as the Bogomil movement, the establishment of the Ohrid Archbishopric, and the reign of Tsar Samuel. The book includes a detailed analysis of the Macedonian language and dialects. Hron highlighted the specific phonetic and grammatical features that set Macedonian apart as a distinct Slavic language.