Gardaí at Dun Laoghaire are seeking the public's assistance in tracing the whereabouts of Thomas Coghlan.
The 62-year-old from Convent Road, Dalkey has been missing since 12pm today.
He is described as being 5’ 9”, slim and has a receding hairline. When last seen he was wearing a light blue shirt.
Anyone with information is asked to contact Dun Laoghaire Garda Station on 01-6665000, the Garda Confidential Line 1-800-666-111 or any Garda Station.