Gardaí in Ronanstown have appealed for assistance tracing 16-year-old Mark Twomey, who was last seen in the Clondalkin area of Dublin last Thursday.
Mark is 1.68m (5'6") tall, with blue eyes and brown hair.
When last seen he was wearing grey tracksuit bottoms with a zip-up top and a white t-shirt.
Mark is known to frequent the Dublin 8 area.
Anyone with information on his possible whereabouts is asked to contact Roananstown Garda Station on 01-6667700 or the Garda Confidential Line 1800-666-111.