Man stabbed during fight in Sydney

A man is in a serious condition in hospital after being stabbed during a fight with another man at an industrial complex in Sydney's inner west.

Police were called to the site in Five Dock shortly before 9pm on Saturday to find a man aged in his early 40s with multiple stab wounds.

He was treated at the scene by ambulance paramedics before being taken to Royal Prince Alfred Hospital in a serious condition.

Police say initial inquiries suggest the injured man got into an argument then a fight with another man who stabbed him before fleeing the scene.

A crime scene has been set up and police are urging anyone with information on the incident to contact Crime Stoppers on 1800 333 000.