Two teenagers assaulted a 34-year-old man and a 41-year-old man on a quiet residential street in Queanbeyan on Thursday night, police say.

NSW Police said a 19-year-old man and a 16-year-old boy approached the two men on Sassafras Crescent some time before 9.15pm Thursday.

One of the teenagers allegedly attacked one of the men with a fence post, bashing him unconscious and causing head and chest injuries. The other man had cuts to the face.  

Both were later taken to hospital; the more severely beaten man was taken to Canberra Hospital, where he currently remains, and the other was taken to Queanbeyan District Hospital.

The investigation is ongoing and police are looking for the two teenagers.

Police urged anyone with information to contact Crime Stoppers on 1800 333 000 or use the NSW Crime Stoppers website.