The Polish question was the issue, in international politics, of the existence of Poland as an independent state. Raised soon after the partitions of Poland in the late 18th century, it became a question current in European and American diplomacy throughout the 19th and parts of the 20th centuries. Historian Norman Davies notes that the Polish question is the primary lens through which most histories of Europe discuss the history of Poland, and was one of the most common topics of European politics for close to two centuries. The Polish question was a major topic at all major European peace conferences: at the Congress of Vienna in 1815, at the Versailles Conference in 1919, and at the Yalta Conference and the Potsdam Conference in 1945. As Piotr Wandycz writes, "What to the Poles was the Polish cause, to the outside world was the Polish question."

The Jewish question, also referred to as the Jewish problem, was a wide-ranging debate in 19th- and 20th-century Europe that pertained to the appropriate status and treatment of Jews. The debate, which was similar to other "national questions", dealt with the civil, legal, national, and political status of Jews as a minority within society, particularly in Europe during the 18th, 19th, and 20th centuries.