A man had a glass thrown at him on the dancefloor of an Oxford pub.
The incident happened at about 10.45pm on Saturday at the Bell and Compass pub in New Road.
The victim, a 25-year-old man, was hit by the glass, cutting him but not severly enough to require him to go to hospital.
The suspect is described as a bald white man, in his mid-twenties, about 5ft 10 and of big build. He was wearing a black short-sleeved top.
Anyone with information should contact investigating officer, PC Kerry Bearryman via the Thames Valley Police Enquiry Centre on 101 or Crimestoppers anonymously on 0800 555 111.