Police were called to Bounds Green Road junction with Nightingale Road, N22 at 21:27hrs following reports of a male stabbed.
Officers and London Ambulance Service attended and found a man, believed to be aged 19, suffering from a stab wound.
He received treatment at the scene before being taken to a central London hospital where his condition remains life threatening.
No arrests have been made. Enquiries continue and a crime scene remains in place.
