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 2000 UEFA European Under-21 Championship was the 12th staging of UEFA's European Under-21 Championship. The final tournament was hosted by Slovakia from 27 May to 4 June 2000. The tournament had 47 entrants. Northern Ireland competed for the first time. For the first time a finals tournament with two groups of four teams was held, with one of those teams, Slovakia, having been chosen as the hosts. The top four teams in this competition qualified for the 2000 Summer Olympics.