Ben Jones, aged 22, was last seen at Doncaster train station at around 9.30pm on Saturday.
Police believe Ben may be in the local area or Lincolnshire.
He is white, 6ft 2ins tall, slim and has short, blond hair.
When he was last seen he was wearing black jogging bottoms, a black hooded jacket with a white logo on the back and white Converse trainers.
Anyone with information on his whereabouts should call South Yorkshire Police on 101.