Police are asking the public to call 999 if they see the man pictured.
Avon and Somerset Police has issued an appeal to help locate 18-year-old wanted man Rakim Fanty.
A police spokesperson said: “Fanty is wanted in connection with a serious assault on teenage boy in Downend last month.
“He’s described as black, 5ft 8ins, of slim build, with short black hair.
“If you see him, please don’t approach him but call 999 and give the call handler the reference number 5221140799.”
If you have any other relevant information, call 101 and use the same reference number.