A 20-year-old man had part of his ear bitten off during an assault at the Atik nightclub in William Street, Windsor in the early hours of Tuesday.
The man was in the main bar area of the nightclub when the attack happened at 1.50am.
The victim required surgery for his injuries and has now been released from hospital.
Police are appealing for any witnesses to come forward.
They have a description of a white man, around 6ft 2ins with short black hair, wearing a navy blue t-shirt - and of a second man shorter than 6ft, of a medium build with short hair, wearing a chequered shirt with a white t-shirt underneath.
If you have any information, call Detective Constable Richard Bates from Maidenhead Force CID on 101, quoting incident reference 43170284931 or Crimestoppers anonymously on 0800 555111.
*An 18-year old man from Windsor has been arrested on suspicion of causing grievous bodily harm and on suspicion of possession of controlled drugs. He has been released under investigation.
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