Police and the family of 15-year-old Marc Shields from the Hazelbank area are growing concerned for his wellbeing.
Marc was last seen at his home in the Hawthorn Grove area on Thursday morning last, February 25.
He is described as being 5ft 10ins tall and of a slim build. He has short brown hair.
Anyone who has seen Marc or knows if his present whereabouts is asked to contact police at Strabane Road on the 101 non-emergency number.