2018–19 Legia Warsaw season

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.

First qualifying round
Legia Warsaw won 4–0 on aggregate.

Second qualifying round
Spartak Trnava won 2–1 on aggregate.

Third qualifying round
F91 Dudelange won 4–3 on aggregate.