consisting of six official youth teams (Under-10, Under-13, Under-14, Under-15, Under-17 and Under-19), based on the young athletes' age.

Olympiacos' U-15, U-17 and U-20 teams all play in Greek Superleague's youth competitions (Super League U-15, U-17 and U-19 respectively), while the U19 team is a regular participant in the UEFA Youth League, winning the title in 2023–24.

The latter also featured in the NextGen Series, reaching the quarter-finals of the competition.

As of 17 September 2021[4] Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

As of 17 September 2021[5] Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.