The 2018–19 I liga (currently named Fortuna I liga due to sponsorship reasons)[6] was the 11th season of the Polish I liga under its current title, and the 71st season of the second highest division in the Polish football league system since its establishment in 1949.

The season was played in a round-robin tournament.

The season started on 20 July 2018 and will conclude on 19 May 2019.

Relegated from Ekstraklasa Promoted from II liga Promoted to Ekstraklasa Relegated to II liga

Team played last season in II liga.