The UEFA European Under-21 Championship, the UEFA Under-21 Championship or simply the Euro Under-21, is a biennial football competition contested by the European men's under-21 national teams of the UEFA member associations. Since 1992, the competition also serves as the UEFA qualification tournament for the Summer Olympics.

The Union of European Football Associations is one of six continental bodies of governance in association football. It governs football, futsal and beach football in Europe and the transcontinental countries of Turkey, Azerbaijan, Georgia and Kazakhstan, as well as the West Asian countries of Cyprus, Armenia and Israel. UEFA consists of 55 national association members. Since 2022, due to the Russian invasion of Ukraine, FIFA and UEFA suspended all Russian national teams and clubs from any FIFA and UEFA competitions.