A man was arrested after a fight in Market Square in Witney on Friday.
At about 2.10am, officers were called to a fight and found a 21-year-old man with facial injuries who was taken to the John Radcliffe Hospital in Oxford.
An 18-year-old man was arrested at the scene and released on police bail.
PC Adrian Brooksbank said: "The incident took place near to Izi's bar and the stop for the number 100 bus to Carterton.
"There was a significant number of members of the public around at the time and we would like to hear from anyone who witnessed the fight."
Anyone with information should contact police on 08458 505505 or speak anonymously to Crimestoppers on 0800 555 111.
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