15-year-old Leigh Arundel has been missing from her home in Knocknaheeny, Cork City, since August 24.
Leigh is described as 5′ 5″ in height, of average build, with blonde hair and blue eyes.
She was wearing a black coloured bomber jacket, check shirt and navy jeans when last seen.
Gardaí are asking for anyone with information to contact Gurranabraher Garda Station on 021 4946200, The Garda Confidential Line 1800 666111 or any Garda Station.