Teens injured in massive Sydney brawl

A teenage boy is in hospital with a fractured eye socket after a massive street brawl outside a pub in Sydney's south.

Up to 50 people were involved in the affray which broke out on Forest Road in Hurstville on Sunday afternoon.

A 17-year-old boy was taken to hospital with a fractured eye socket, while another 17-year-old male has non life-threatening injuries, police said.

A girl, 15, was arrested for offensive language and is expected to receive a youth caution.

Police have not arrested anyone over the assaults.