16 year old Jason Collins was last seen on the 16th December in the Blanchardstown Retail Park at around 1.45pm.
He's 5' foot 4", slim with short brown hair and blue eyes.
When last seen he was wearing a black Nike runners, grey tracksuit bottoms, white t-shirt and red hoodie with a black zip up top over the hoodie.
Anyone with information is asked to contact Gardaí.
