NSW police are appealing for witnesses to the incident, which happened about 12.20am Sunday outside a club on Brown Street, Queanbeyan, when a group of people were leaving the building.

"Police from Monaro Local Area Command have been told a 35-year-old woman was allegedly knocked to the ground; she was then allegedly hit by another woman with a beer bottle, causing a cut over her left eye," NSW police said in a statement.

"The crowd dispersed when police and paramedics arrived at the scene. The woman was taken to Queanbeyan Hospital where she is undergoing treatment; the injury is not considered life-threatening."

Police ask anyone with information about the incident to contact Queanbeyan Police Station or Crime Stoppers on 1800 333 000.