Leigh Leech has been missing from his home in Coolock since Tuesday, March 22.
He was last seen on Elm field Avenue, in Clarehall, at around 10pm on the date.
He is described as being 5 foot 8 inches in height, with dark brown short hair and of average build.
Leigh was wearing a navy tracksuit bottoms, blue runners, grey hoodie and black jacket when last seen.
Anyone with information regarding the teenager’s whereabouts is asked to contact Coolock Garda station at 01 6664200.