Cill Ghallagáin (anglicised as Kilgalligan) is a small Gaeltacht coastal townland and village in the northwest corner of Kilcommon Parish, County Mayo, Republic of Ireland, an area of in size. Off the northern coast of this townland lies Kid Island, an island of rising on steep cliffs to a height of above sea level. The island is used for grazing sheep in the summer months. Kilcommon Parish consists of two peninsulas – Dún Chaocháin (on which Cill Ghallagáin lies) and Dún Chiortáin, to the west.