St. Mochta's F.C. is an Irish association football club based in Clonsilla, Dublin. Their senior team play in the Leinster Senior League Senior Division. They also regularly compete in the FAI Cup, the FAI Intermediate Cup, the FAI Junior Cup and the Leinster Senior Cup.
St. Mochta's were founded in September 1949 when founder Barth O'Brien put a motion to the AGM of the St. Mochta's Branch of the Catholic Young Men's Society (CYMS) that a football section be formed within the branch. At the time, it was unsure exactly what type of football the club would play, considering that it could mean association football, rugby football, or gaelic football. After a vote from aspiring members, association football or soccer was chosen.
In its early years, the club played its football at Somerton on the same grounds where Castleknock GAA club now play and briefly in Coolmine Lane, close to Coolmine railway station before permanently establishing themselves at Porterstown. In the early 1960s the CYMS became defunct but the club continued as St. Mochta's.