Gardaí are appealing for information regarding Katelyn Comerford, who was last seen in the Dublin 8 area, on Monday 20th February.
The 18 year-old is known to frequent the city centre, and Balbriggan areas.
Katelyn is described as being 5 feet 4 inches in height, with a slim build.
She has brown, shoulder length hair and blue eyes.
Anyone with information is asked to contact Kevin Street Garda Station: 01 666 9400
The Garda Confidential Line: 1800 666 111
or any Garda Station.