RTS Widzew Łódź (Polish pronunciation: ) is a Polish football club based in Łódź. The club was founded in 1910. Its official colours are red and white, hence their nicknames Czerwona Armia (Red Army) and Czerwono-biało-czerwoni (Red-white-reds). They compete in the Ekstraklasa, the top tier of the Polish football league system, since the 2022-23 season.
The club was founded on 5 November 1910; 107 years ago as Towarzystwo Miłośników Rozwoju Fizycznego Widzew (Society of Lovers of Physical Development Widzew) in Widzew, then a suburb (now district) of Łódź. In 1922 the club transformed into Robotnicze Towarzystwo Sportowe Widzew (Workers' Sports Society Widzew).
Widzew has won four Polish league championships (in 1981, 1982, 1996 and 1997) and the 1985 Polish Cup.
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