A man in his thirties was taken to hospital after being assaulted by a group of men in the car park of The Moonrakers Pub in Swindon.
It happened just before midnight on Friday 23 November.
Police say his injuries to his face were so serious he has undergone emergency surgery.
This was a vicious attack and we would like to hear from anyone who may have heard or seen the assault or a group of men acting suspiciously in this area before or after midnight. This is a busy part of town with a busy main road nearby, so someone may have witnessed something. If that was you please come forward.
Police ask people who saw what happened to call them on 101 with the crime reference number 54180111448 or call Crimestoppers anonymously 0800 555 111.