Police were called at approximately 7.45pm on Sunday, September 8 to reports of a male stabbed close to Canons Park Underground Station near Stanmore.
Officers attended and found a 16-year-old boy injured on Whitchurch Lane.
He was taken by the London Ambulance Service to a central London hospital for treatment.
His injuries are not believed to be life-threatening.
There have been no arrests and enquiries continue.
Any young people who have information about violence or knife crime can visit fearless.org where they can pass on information anonymously – your I.P address will not be traced.
Fearless is part of the Crimestoppers charity, and is also independent of the police.
Picture courtesy of RM Gada/#Fixit Harrow Facebook Group