David Corbridge, 70, was last seen leaving his home address in Norham on foot at around 11.50am this morning.
Enquiries to locate him are ongoing but police are growing increasingly concerned for his welfare.
David is described as white, 5ft11in tall, of average to large build and with white, grey hair. He is believed to be wearing a navy blue polo shirt and jeans.
David, or anyone who knows his whereabouts, should call police on 101 quoting log 440 11/07/18.