Gardaí in Galway city are seeking assistance tracing 39-year-old James Ryan from Gort Leinn, Old Monivea Road, Galway.
Mr Ryan, whose family is from Co Waterford, was last seen on Tuesday evening in Claregalway, Co Galway.
He was driving his gold-coloured Nissan Almera hatchback, registration number 04-W-382, when he was last seen.
Mr Ryan is 1.78m (5'10") tall, of medium build and has short black hair.
He was last seen wearing a dark-coloured jacket, light shirt, blue jeans and dark brown shoes.
Anyone with information on his whereabouts is asked to contact Galway Garda Station on 091-538000, the Garda Confidential Line 1800-666-111 or any garda station.