The man was last seen in Dublin 8.
Gardaí in Kilmainham are seeking the public's assistance in tracing the whereabouts of 66 year old Des O'Brien, who was reported missing on the 8th of October, 2018 from his home in Kilmainham.
Des was last seen at approximately 3.45p.m. on Monday when he left his home and was seen later on CCTV on Emmet Road, Dublin 8.
Des is described as 5"2' in height, with grey hair and clean shaven.
Des was wearing a dark bomber jacket with a fur type collar, a dark red jumper, blue jeans and blue canvas runners with white soles.
We are appealing to anyone who may of seen Des or who may know of his whereabouts to contact Kilmainham Garda Station on (01) 666 9700, the Garda Confidential Line on 1800 666 111 or any Garda Station.