Celtic B are the reserve team of Celtic Football Club. They are based in Airdrie and compete in the Lowland League. Celtic have run a reserve side since the early days of the club, comprising a combination of emerging youth players and first-team squad players. The current "B" side forms the highest level of the academy structure at Celtic, beneath which there are four junior strands: Professional Academy (Under 18s), Intermediate Academy (Under 13s, 14s, 15s & 16s), Junior Academy (Under 10s, 11s & 12s) and Development Centres (five years old and above).

Celtic U20 to juniorski zespół piłkarski szkockiego klubu Celtic F.C., który rywalizuje w Scottish Challenge Cup oraz w Scottish Development League.