The Fredericton Police Force is seeking the public's help in locating William MacLennan, 56, who has been missing since Feb. 21.
MacLennan was last seen in the downtown area, where he is often seen walking alone at any time in the day or night, police said in a statement issued Friday afternoon.
He tends to wear large dark coats and is usually smoking a cigarette or a cigar while drinking coffee, the statement said.
"He can often be seen talking to himself and walks with a slow swaying gait."
MacLennan is described as being Caucasian, six feet tall and 190 pounds, with short greying hair.
Anyone with information about his whereabouts is asked to call police at 506-460-2300 or Crime Stoppers at 1-800-222-TIPS (8477).