36-year-old John O’Sullivan was last spotted in the Ballyphehane area last Friday morning.
He is described as being 6 foot 1 in height and slim build.
He was dressed in casual clothing, wearing jeans and a hoodie jacket when last seen. He is believed to be driving a red Ford Fiesta with registration plate 04-C-11678
Anyone with information regarding John’s whereabouts is asked to contact Gardai.