Brian Arthur Ross, 66, was last seen at his home in Surrey Road at approximately 10.30am on Sunday 12 January 2014.
He is of slim build, around five feet nine inches tall with thinning grey hair. Brian wears glasses and is softly spoken with a local accent. It is not known what he was wearing at the time he left his home.
Detective Sergeant Julie Dransfield, of Bournemouth CID, said: “I understand that Brian was upset before his disappearance and due to the time that has lapsed since he was last seen we are very concerned for his welfare.
“We have information that Brian booked a plane ticket to Spain for the middle of January but did not turn up for his flight.
“It is important that Brian, or anyone who knows of his whereabouts, comes forward as soon as possible.”
Anyone with information or knowledge as to Brian’s whereabouts should call Dorset Police on 101 quoting incident number 20:107.