The missing 58-year-old, named only as David, was last seen in Laughton, Rotherham, at around 5.30pm on Saturday, July 2.
He is known to frequent the Dinnington and Thurcroft areas of Rotherham.
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South Yorkshire Police officers are urging anyone who has seen him to get in touch.
Call the force on 101 with details of possible sightings.