The 17-year-old was last seen in Sligo Town on Saturday, August 1
Gardai are seeking the public's assistance in tracing the whereabouts of missing person Cian Dwyer in Sligo.
The 17-year-old was last seen over the August Bank Holiday weekend on Saturday, August 1 in Sligo Town.
Cian is described as being 5'11, of slim build and has short brown hair.
A garda spokesperson said: "When last seen he was wearing a black jacket and grey tracksuit bottoms.
"Anyone with any information is asked to contact Garda in Sligo on 071 915 7000, the Garda Confidential Line on 1800 666 111, or any Garda station."