Cortoon Shamrocks is a Gaelic Athletic Association club based in County Galway. The club is a member of the Galway GAA. Underage teams up to U-16's play in the Galway league and championships and they compete at all levels of Galway football.
Cortoon are one of the oldest clubs in the county, and are unique in that they are the second senior football team in the one parish in Galway, Cortoon is a half parish of Tuam. They achieved Senior status in the early seventies in a team powered by Tommy Joe Gilmore and Mickey Rooney, they managed to reach the semi final on two occasions, losing to Caltra and Milltown. They then dropped again from senior status twice, but successfully fought hard to regain senior status and they are amongst the best teams of Galway football.