Communist parties are generally associated with proletarian internationalism. However, a number of communist parties had a double face: an official internationalist one and a hidden nationalist one. Present-day Czech Communists successfully build on this tactic. This paper will answer the following research questions: What causes the strong nationalist orientation of contemporary Czech Communists? What type of nationalism does it represent? And is the outlined continuity between the interwar period and the present-day accidental or is it (at least partly) caused by certain objective political and/or social factors?