The victim, in his 20s, was knifed in Austin Road, off Pump Lane, just before 11pm last night (Thursday).
He had been confronted by three men and chased into the cul-de-sac, before he stumbled over and was assaulted.
He was stabbed in the chest, and parademics rushed him to a West London hospital.
His injuries are now not life-threatening, and he is in a stable condition.
Police are looking for witnesses.
If you have any information about this incident, call Uxbridge Police Station on 0208 246 1477, or Crimestoppers on 0800 555 111