An intoxicated man approached three other men walking down a laneway leading from Trinity Bar towards Woolley Street in the suburb, leading to a fight at around 11.30pm, police said.

One man was taken to The Canberra Hospital for treatment for what police describe as "a serious bite to his ear".

The man who confronted the group is described as being of Caucasian appearance, with an average height and build with brown hair.

He was wearing jeans and a white t-shirt at the time.

Police are urging witnesses to contact Crime Stoppers on 1800 333 000, or at act.crimestoppers.com.au.