Leeds United Football Club Under-21s is the most senior of Leeds United's youth teams and the club's former reserve team.

[2] The under-23s replaced the club's under-21 team in 2016, which had replaced the reserve team in 2012 following the English game's reform of the youth football and the introduction of the Elite Player Performance Plan.

Only players born after 1 January 2006 (primarily scholars), are eligible to play for the Under 18s.

The following list includes players who have graduated from Leeds' youth system to make their senior debut for the first team.

Players who have represented their national team at senior level are highlighted in bold.