Sussex Police is concerned for the welfare of missing man Jack Jenkins last seen in Brighton on Monday (August 28).
Police said Jack, 28, who does not have a permanent home in Brighton, normally sleeps in a tent and it is out of character for him to sleep elsewhere.
He is described as white, 5ft 11, of slim build, brown eyes, with black short straight hair and stubble. Jack was wearing a Nike black hooded tracksuit with a double white stripe down each arm and he has the name Tony tattooed on the right side of his neck.
Police said he may have travelled to the Central London area.
Anyone with information is asked to contact police online or call 101 quoting serial 1106 of 28/08. In an emergency or if the person is in danger call 999.