The 2010–11 I liga was the 63rd season of the second tier domestic division in the Polish football league system since its establishment in 1949 and the 3rd season of the Polish I liga under its current title. The league was operated by the Polish Football Association (PZPN).
The league is contested by 18 teams who competing for promotion to the 2011–12 Ekstraklasa. The regular season was played in a round-robin tournament. The champions and runners-up would receive promotion. The bottom four teams were automatically demoted to the II liga.
Teams
Relegated from 2009–10 Ekstraklasa: Odra Wodzisław Piast Gliwice
2009–10 I liga teams remaining in the league: Dolcan Ząbki Flota Świnoujście GKS Katowice GKP Gorzów Wielkopolski Górnik Łęczna KSZO Ostrowiec Świętokrzyski ŁKS Łódź MKS Kluczbork Podbeskidzie Bielsko-Biała Pogoń Szczecin Sandecja Nowy Sącz Warta Poznań
Promoted from 2009–10 II liga: Ruch Radzionków Górnik Polkowice LKS Nieciecza Kolejarz Stróże