Officers are concerned for the welfare of Paul Barnard who was reported missing on 15 June.
They are carrying out enquiries and searches to locate him but are also asking for the public to report any sightings to them.
Mr Barnard is described as white, around 6ft 1in tall, and is of thin build. He has light brown shaven hair and tattoos on his right arm. He usually wears a tracksuit and baseball cap.