A spokesperson for London Metropolitan Police said: “Police were called at 5.50pm on Sunday, January 31, to reports of a fight on board a bus in Haringey.
“Officers attended and found a 15-year-old boy suffering from a stab injury in the vicinity of Lansdowne Road, N17.
“He was taken by the London Ambulance Service to an east London hospital for treatment; his injuries are not believed to be life-threatening.
“Three males were arrested nearby on suspicion of causing grievous bodily harm.
Police are now appealing to witnesses, or anyone with information regarding the incident, to come forward.
They can call police via 101 quoting reference Cad 5555/31Jan, or remain anonymous by contacting Crimestoppers on 0800 555 111.