England's national Under-21 football team, also known as England Under-21s or England U-21s, is considered to be the feeder team for the England national football team.

This team is for English players aged 21 or under at the start of a two-year European Under-21 Football Championship campaign, so players can be, and often are, up to 23 years old. Also in existence are teams for Under-20s (for non-UEFA tournaments), Under-19s and Under 17s. As long as they are eligible, players can play at any level, making it possible to play for the U-21s, senior side and again for the U-21s, as Kieran Richardson, Darren Bent and Theo Walcott have done recently. It is also possible to play for one country at youth level and another at senior level (providing the player is eligible). Nigel Quashie is a current Scotland international and former England U-21 player.

The U-21 team came into existence, following the realignment of UEFA's youth competitions, in 1976. A goalless draw in a friendly against Wales at Wolves' Molineux Stadium was England U-21s' first result.

England U-21s do not have a permanent home. They play in stadia dotted all around England, in an attempt to encourage younger fans in all areas of the country to get behind England. Because of the smaller demand compared to the senior national team, smaller grounds can be used. The record attendance for an England U-21 match was set on March 24 2007, when England U21 played Italy U21 in front of a crowd of just under 60,000 at the brand new Wembley Stadium, also a world record attendance for a U21 game. The match was one of the required two "ramp up" events the stadium hosted in order to gain its safety certificate in time for its full-capacity opening for the 2007 FA Cup Final in May.