The 2018–19 Legia Warsaw season is the club's 102nd season of existence, and their 82nd in the top flight of Polish football.

Legia entered the 2018–19 season as the defending Ekstraklasa champions.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Legia Warsaw won 4–0 on aggregate.