A 20-year-old man suffered serious facial injuries following an unprovoked attack in Wombwell on Halloween.
The man required hospital treatment after being attacked from behind in the street.
The incident happened at around 10.30pm on October 31.
Police said the man had left the Squires pub in Hough Lane, Wombwell and was walking towards the Alma pub with a friend.
He was attacked outside a solicitors in Hough Lane, the man was reportedly assaulted from behind by an unknown man in what is believed to be an unprovoked incident.
Police are appealing for witnesses to come forward. Anyone with information is asked to call Barnsley CID on 101 quoting incident number 703 of November 3.