The Sweden national under-21 football team is the football team representing Sweden in competitions for under-21 year old players and is controlled by the Swedish Football Association. The Swedish U21 team came into existence, following the realignment of UEFA European Under-23 Championship, which changed to be an Under-21 competition in 1978.

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.