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 Football Club was established in September 1949, after founder Barth O'Brien suggested the formation of a club to the St. Mochta's branch of the Catholic Young Men's Society (CYMS) during their annual general meeting. O'Brien was asked to form a football section and he sought out young people to determine interest as well as the 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, also known as soccer, was chosen.
In its early years, the club played 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 on as St. Mochta's.
The club's home ground is known as Porterstown Road.
In 2007, the club qualified for that season's FAI Cup.