Dundalk Football Club (Irish: Cumann Peile Dhún Dealgan) is an Irish professional association football club based in Dundalk, County Louth. The club currently plays in the League of Ireland Premier Division and are the current reigning champions. Founded in 1903, it is the second most successful team, in terms of trophies won, in the history of the League of Ireland. The traditional colours of the club are white jerseys with black shorts. Because of the white jerseys, the team has been nicknamed The Lilywhites. Home games are played in Oriel Park. A local rivalry is shared with Drogheda United, their Louth neighbours, who entered the League in 1963 as Drogheda FC and later became Drogheda United in 1975.
Since 1999, and in conjunction with Irish League side Linfield of Belfast, the club has been engaged in a peace and reconciliation programme, known as the Dunfield Project, which through the medium of football is facilitating the coming together of young people from the Dundalk and Belfast communities. In 2002, the club won the FAI Cup for a ninth time. The club operated as a co-operative, with teams competing from school-boy level in Dublin-based leagues to girls' and ladies' teams, along with the first-team for a period until August 2006, when it was taken over by a local business man, Gerry Matthews. Dundalk celebrated its 2000th league game against Finn Harps on Thursday 8 March 2007 in Oriel Park to a crowd of 3,000 spectators.
In 2016, the club became the first Irish side to reach the play-off round of the UEFA Champions League after their shock 3–1 aggregate win over FC BATE Borisov. They were beaten by Legia Warsaw in the final play-off round and instead participated in the UEFA Europa League. They became the first Irish side to win a group stage game in European competition when they beat Maccabi Tel Aviv 1–0 at home.