An 18-year-old man was left with a serious neck injury after the attack in a Glasgow bar in May.
The man is described as white, tall, with short brown hair and a protruding nose.
At the time he was wearing blue jeans, a white shirt and a khaki green bomber style jacket.
Det Con Nikki McPherson said: "This was a brutal attack that left a man with serious injuries and requiring urgent medical treatment."
She added: "It is important that we trace whoever is responsible as soon as possible.
"I would ask anyone who recognises the man in the CCTV image to contact police as he may be able to assist with our inquiries."
The victim was taken to the Queen Elizabeth University Hospital after the attack at The Argosy bar in Paisley Road West, Cardonald. He has since been discharged
The attack took place during a party at about 23:00 on 13 May.
Det Con McPherson said: "We would also like to hear from anyone who witnessed this incident and is yet to come forward and speak to police, so please do get in touch."
Police have issued a CCTV image of a man they wish to trace over an assault with a weapon in a pub.