A man's jaw was broken in three places following an unprovoked attack outside a city centre restaurant.
The assault took place at about 11.30pm on March 9 in a walkway between the Watershed and The Stable.
Police have released a CCTV image of a man they want to trace in connection with the assault.
A 21-year-old victim was left with a broken jaw and police have said the attack was "apparently unprovoked".
A spokesperson for Avon and Somerset Constabulary said: "We are appealing for help to trace this man in connection with an assault in Bristol which left another man with a broken jaw.
"Anyone who can help officers trace the man in this image is asked to get in touch through www.avonandsomerset.police.uk/contact , or by calling 101, quoting reference 5219051697.
"Alternatively ring the independent charity Crimestoppers on 0800 555 111. They never ask your name or trace your call."
