A 25-year-old man suffered head injuries when he was attacked on Melksham High Street in the early hours of Saturday.
He was attacked by unknown assailants outside Chick-O-Land at around 2.20am, and was taken to the Royal United Hospital in Bath by paramedics.
Police want to speak to a white male thought to be involved, who was wearing a black top with a red collar, and has tattoos on his neck.
Anyone with information is asked to contact the Melksham policing team on 101 or anonymously, via Crimstoppers, on 0800 555111.
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