Detectives are appealing for information following an incident at licensed premises on Ballymoney Street, Ballymena, in the early hours of Monday 28th October.
It was reported to police that at around 2.10am, as a man was leaving the premises he was approached from behind by a unknown male who, without provocation, bit a part of his ear off.
The male then made off from the scene on foot.
The injured man was later taken to hospital for treatment.
An investigation is underway and detectives are appealing for anyone who witnessed the incident or who has CCTV or dash-cam footage from the area which could assist them with their enquiries, to contact them at Antrim on 101, quoting reference number 113 28/10/24.
A report can be submitted online using the non-emergency reporting form here or you can contact Crimestoppers anonymously on 0800 555 111 or online here.