The brawl broke out on Rothery St about 10pm after a large number of people left a party in nearby Chounding Crescent.

The teen was stabbed during the brawl, police said.

Emergency services attended the scene and the injured teen was rushed to Wollongong Hospital for treatment.

He suffered cuts to his arm, chest, stomach and chin.

A crime scene was established in Rothery St and examined by specialist forensic officers.

Wollongong Detectives are now investigating the stabbing and are looking for a male who has been described as being of Caucasian appearance, 19 to 21 years old, 175cm tall with a slim build and short brown hair.

He was wearing a polo shirt with thick horizontal black and white stripes and shorts.

Anyone with information about this incident should call Wollongong Police via Crime Stoppers on 1800 333 000