Many players have come through Middlesbrough's academy who have either gone on to play for the first team or have gone on to have successful careers elsewhere. The following are players who have made professional appearances, either for
Middlesbrough or another football club, during their careers. They are organised in order of the date they signed their first professional contract with Middlesbrough (from 1997 onwards). Appearances for those who played for Middlesbrough are counted as all professional appearances for the club in all competitions. Players who are still contracted to the club (including players loaned out elsewhere) are highlighted in
bold.
Players who have played for Middlesbrough Players who have played for other football clubs Players who have played at international level Many players who have come through the youth ranks at
Middlesbrough have appeared for their national team at both senior and youth levels. The following is a list of those players organised by national team and alphabetical order respectively. ==Honours==