Two men needed hospital treatment after they were attacked in a York bar.
The men were set upon by three men at the Manahatta Bar on Little Stonegate at around 8.30pm on Saturday, 24 July.
Police took the victims to hospital for treatment to their injuries. They were later released.
Officers are asking members of the public to get in touch if they recognise the person in the image as they believe they may have information that will help the investigation.
Anyone with any information is asked to contact North Yorkshire Police – details below.
How to help the police