2017–18 Legia Warsaw season

The 2017–18 Legia Warsaw season is the club's 101st season of existence, and their 81st in the top flight of Polish football. Legia entered the 2017–18 season as the defending Ekstraklasa champions.

Polish Cup
Legia Warsaw won 7–3 on aggregate.

Legia Warsaw won 3–2 on aggregate.

Second qualifying round
Legia Warsaw won 9–0 on aggregate.

Third qualifying round
Astana won 3–2 on aggregate.

Play-off round
''1–1 on aggregate. Sheriff Tiraspol won on away goals.''