Tristen Quinn from Sarsfield Road was last seen on Wednesday night in the Doughcloyne area of Togher.
He is described as 6 ft tall, of slim build with brown hair and blue eyes.
Tristen was wearing a black woolly hat, black hoodie, combat pants, grey shoes and had a black and white bag with him when he was last seen.
Gardaí and Tristen’s family are concerned for his well-being and anyone with information is asked to contact Gardaí in Togher on 021 4947120.
