2021 UEFA European Under-21 Championship

The 2021 UEFA European Under-21 Championship (also known as UEFA Under-21 Euro 2021) will be the 23rd edition of the UEFA European Under-21 Championship (26th edition if the Under-23 era is also included), the biennial international youth football championship organised by UEFA for the men's under-21 national teams of Europe. The tournament will be co-hosted by Hungary and Slovenia in 13–27 June 2021.

Initially, 12 teams were to play in the tournament, however on 6 February 2019, UEFA's Executive Committee increased this number to 16. Only players born on or after 1 January 1998 are eligible to participate.

Host selection
The following associations indicated their interests to bid for the tournament:
 * 🇭🇺 Hungary / 🇸🇮 Slovenia (joint bid)

Hungary and Slovenia were appointed as co-hosts at the UEFA Executive Committee meeting in Dublin, Republic of Ireland on 3 December 2018.

Qualification
All 55 UEFA nations entered the competition, and with the co-hosts Hungary and Slovenia qualifying automatically, the other 53 teams will compete in the qualifying competition to determine the remaining 14 spots in the final tournament. The qualifying competition consists of two rounds:
 * Qualifying group stage: The 53 teams are drawn into nine groups: eight groups of six teams and one group of five teams. Each group is played in home-and-away round-robin format. The nine group winners and the best runners-up (not counting results against the sixth-placed team) qualify directly for the final tournament, while the remaining eight runners-up advance to the play-offs.
 * Play-offs: The eight teams are drawn into four ties to play home-and-away two-legged matches to determine the last four qualified teams.

The draw for the qualifying group stage will be held on 11 December 2018. The qualifying group stage will take place from March 2019 to October 2020, while the play-offs will take place in November 2020.

Qualified teams
The following teams qualified for the final tournament.

Note: All appearance statistics include only U-21 era (since 1978).

Venues
On 3 December 2018, Slovenian Football Association announced pre-selected venues:
 * Stadion Z'dežele, Celje
 * Stožice Stadium, Ljubljana
 * Ljudski vrt, Maribor

The Hungarian Football Federation proposed the following venues:
 * MOL Aréna Sóstó, Székesfehérvár
 * Haladás Sportkomplexum, Szombathely
 * Groupama Arena, Budapest

The opening match will be in Slovenia, while the final will be in Hungary.