An injured woman has been found lying beside a road in Sydney’s north-west in the early hours of the morning.

Emergency services were called to Euston Street in Rydalmere about 2.30am on Tuesday after a passing motorist spotted her lying on the side of the road.

The 23-year-old, who appeared to have facial injuries and bruising to her body, was taken to Westmead Hospital in a stable condition. A crime scene has been set up.

AAP