The 19-year-old and a 20-year-old allegedly involved in the same incident are the latest to be charged over the Pyrmont brawl, which broke out at a Wattle Crescent unit on Saturday night.
Police were told about 20 people showed up to the party, including some uninvited guests.
They were called to the unit about 11pm and soon found the 19-year-old in a nearby park with multiple stab wounds to his leg and head.
He suffered non-life-threatening injuries and was rushed to hospital, where he was arrested about 1.20pm on Sunday and remained under police guard until Monday, when he was taken to Day Street police station.
Once there, officers charged him with one count of wounding someone with intent to cause grievous bodily harm and one count of using an offensive weapon to commit an indictable offence.
A 20-year-old arrested at a Kings Cross business was also charged with wounding someone with intent to cause grievous bodily harm.
Both men are due to face Central Local Court on Tuesday.
Two teens, aged 15 and 17, faced a children’s court on Sunday over bail offences. The older boy was also charged with carrying a knife in public.
Seven men and boys, aged between 12 and 21, had initially been arrested following the brawl.
Five were released pending further investigations, which are ongoing.
A 16-year-old boy hit on the head with a glass bottle also suffered minor injuries in the fight.