Gardaí are appealing to the public for assistance in tracing the whereabouts of 24 year old Dennis Costigan.
Denis is missing from his home in Ballyfermot, since 13th June, 2019.
Dennis was last seen when he left Tallaght Hospital at approximately 2pm on Thursday afternoon last.
He is described as being 6'1" in height, medium build with mousey-brown hair and blue eyes.
It is not known what Dennis was wearing when he went missing.
Any information on Dennis's whereabouts should be report to Ballyfermot Garda Station on 01 - 6667200, the Garda Confidential Line on 1800 666 111 or any Garda Station.