In sports, 1. Liga, 1. liga, I Liga or Erste Liga may refer to:
Association football 1. Bundesliga, football league in Germany Latvian First League, (1. līga), football league in Latvia I liga, the second tier of the Polish football league system I liga (women's football), the second tier of the women's Polish football league system 1. Liga Promotion, the third tier of the Swiss football league system 1. Liga Classic, the fourth tier of the Swiss football league system 1. Liga (Slovakia), former name of the second-highest football division in Slovakia Austrian Football First League (German: Erste Liga), the second highest division in Austrian football league system Czech First League, the top tier of the Czech football league system Primeira Liga (Portuguese: Primeira Liga), the top tier of the Portuguese football league system Russian First League, the second tier of the Russian football league system
Ice hockey Czech 1. Liga, second-highest ice hockey division in the Czech Republic Polish 1. Liga, second-highest ice hockey division in Poland Slovak 1. Liga, second-highest ice hockey division in Slovakia Swiss 1. Liga (ice hockey), third-highest ice hockey league in Switzerland Erste Liga (ice hockey), an international ice hockey league
Basketball I Liga (basketball), second level basketball league in Poland
Rugby I liga Rugby, second-highest rugby union league in Poland
Speedway Polish Speedway First League, second-highest motorcycle speedway league in Poland
See also I Lyga, football league in Lithuania A-1 Liga, basketball league in Croatia Liga (disambiguation) 2. Liga (disambiguation) 3. Liga (disambiguation) Prva Liga (disambiguation) Liga 1 (disambiguation) Liga I, a Romanian professional league for men's association football clubs