Gardaí are seeking the public's help in tracing the whereabouts of Jodie Mulvihill.
The 16-year-old has been missing since Friday, August 17.
The teen is described as being 5'5", with brown hair, with a nose piercing, of slim build with brown eyes.
Jodie was last seen wearing a black jacket, grey bottoms and white runners.
The teenage was last sighted on Main Street, Swords, on August 17.
It is believed Jodie may be in the Mullingar area.
Anyone with information on her whereabouts are asked to contact Gardai in Ronanstown on 01 666 7700.