The Irish League is a professional football league in Northern Ireland, established in 1890. It is one of the oldest football leagues in the world and features clubs from across the region. The league operates on a system of promotion and relegation with the NIFL Championship, allowing teams to move between the two tiers based on their performance. The league consists of several teams, with the most successful being Linfield FC, which has won numerous titles. Matches are typically held on weekends, and the league season runs from August to May. The Irish League is an important part of Northern Ireland's sports culture and community.