Balally (Irish: Baile Amhlaoibh, meaning "Olafs' Town"), County Dublin, Ireland, is a residential area between Dundrum village and the Sandyford Industrial Estate in Sandyford.Balally Parish itself reaches from Ardglas to the M50 motorway. It has two primary schools (St. Olaf's National School] and Queen of Angels) and two secondary schools (St.