Richard Gibbons, 54 years old, was last seen at his home address in the Alderney area in the early hours of Thursday, 18 April. He has been upset recently and his family are concerned that he may come to some harm.
Sergeant Steve Lyne, of Dorset Police, said: “By 7am Richard had left his home and it is not known where he went.
“His family are concerned as they have not heard from Richard and he has no access to a vehicle, money or mobile phone.”
Richard is white, five feet seven inches tall, of a slight build, with mid brown shoulder length hair.
It is believed that he is wearing a dark grey Superdry jacket with a yellow logo on the shoulder, black or blue jeans and black plimsolls.
Sergeant Lyne continued: “Richard’s family are extremely worried about him and I would urge anyone who knows of his whereabouts to contact Dorset Police as soon as possible.
“I would urge Richard to contact us – we simply want to make sure that you are safe and well.”
Officers, assisted by the Force helicopter, have been searching the area.
Anyone with any information or knowledge as to Richard’s whereabouts should call Dorset Police on 101 quoting incident number 18:51.