Silesians (Ślōnzŏki or Ślůnzoki; Silesian German: Schläsinger or Schläsier; Schlesier; Ślązacy; Slezané) is a geographical term for the inhabitants of Silesia, a historical region in Central Europe divided by the current national boundaries of Poland, Germany, and the Czech Republic. Historically, the region of Silesia (Lower and Upper) has been inhabited by Germans (German speakers), Czechs, Poles, and Slavic Upper Silesians. Therefore, the term Silesian can refer to anyone of these ethnic groups. However, in 1945, great demographic changes occurred in the region as a result of the Potsdam Agreement leaving most of the region ethnically Polish and/or Slavic Upper Silesian.
There have been some debates on whether or not the Silesians (historically, Upper Silesians) constitute a distinct nation. In modern history, they have often been pressured to declare themselves to be German, Polish or Czech, and use the language of the nation which was in control of Silesia. Nevertheless, 847,000 people declared themselves to be of Silesian nationality in the 2011 Polish national census (including 376,000 who declared it to be their only nationality, and 431,000 who declared joint Silesian and Polish nationality. That is, about 10% of the population of the Polish part of Upper Silesia declares themselves as only Silesians), making them the largest minority group. About 126,000 people declared themselves as members of the German minority (58,000 declared it jointly with Polish nationality), making it the third largest minority group in the country (93% of Germans living in Poland are in the Polish part of Silesia). 31,301 people declared Silesian nationality in the Czech national census of 2021, including 18,850 of those who declared two nationalities (44,446 in Czechoslovakia in 1991), and 6,361 people declared joint Silesian and Moravian nationality in the Slovak national census. Over 85% of the population in the Polish part of Upper Silesia declare themselves as Poles, and in the Czech part as Czechs.