Helsingin Jalkapalloklubi, commonly known as HJK Helsinki, or simply as HJK, is a professional football club based in Helsinki, Finland. The club competes in the Finnish Veikkausliiga, of which they are the reigning champions. Founded in 1907, the club has spent most of its history in the top tier of Finnish football. The club's home ground is the 10,770-seat Telia 5G -areena, where they have played since 2000.
Generally considered Finland's biggest club, HJK is the most successful Finnish club in terms of championship titles with 29. The club has also won 13 Finnish Cups and 5 Finnish League Cups. Many of Finland's most successful players have played for HJK before moving abroad. The club has also similar success with women's Naisten Liiga.
HJK is the only Finnish club that has participated in the UEFA Champions League group stage. In 1998, they beat Metz in the play-off round to clinch their place in the competition for the following season. HJK has also participated in the UEFA Europa League, in 2014–15, defeating Rapid Wien in the play-off round.