Police were called at 20:56hrs on Monday, 31 March to Quill Street, N4 following reports of a fight.
Officers and LAS attended. A 16-year-old boy was taken to an east London hospital suffering from a stab wound. He remains in a stable condition.
Officers from Islington are investigating.
Enquiries continue. No arrests.
At this stage, the assault is not being linked to any other incidents.
If you have any information on the attack call the police on 101