The 1974 UEFA European Under-23 Championship, which spanned two years (1972–74) had 21 entrants. Hungary U-23 won the competition.
The 21 national teams were divided into eight groups (five groups of 3 + three group of 2). The group winners played off against each other on a two-legged home-and-away basis until the winner was decided. There was no finals tournament or 3rd-place playoff.
References
1974 UEFA European Under-23 Championship Wikipedia(Text) CC BY-SA