The 2012–13 season was Olympiacos's 54th consecutive season in the Super League Greece and their 87th year in existence. They competed in the Greek Super League, Greek Cup, UEFA Champions League and UEFA Europa League.
Olympiacos completed a domestic double, winning the Super League and the Greek Cup. Olympiacos won the title for a third consecutive season, reaching 40 domestic titles and therefore adding a fourth star to the team's shirt.
The club finished third in Group B of the Champions League, which resulted in them entering the Europa League. Olympiacos was eliminated in Round of 32 by Levante with two defeats, falling 0–4 on aggregate.
Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
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