Emergency services were called to Kilburn High Road near Netherwood Street at around 8.30pm yesterday (June 30).
Officers arrived alongside paramedics and an air ambulance team to find the 16-year-old boy injured.
The teenager was taken to hospital with injuries that have been assessed not to be life-threatening or changing.
There have been no arrests but an investigation is ongoing and officers are asking anyone with information to make contact.
A Met spokesperson said: “At around 20:30hrs on Monday, 30 June police were called by the London Ambulance Service to reports of a stabbing in Kilburn High Road, NW6.
“Officers attended the scene alongside London’s Air Ambulance where it was discovered that a boy, aged 16, had been robbed of his phone and personal belongings and stabbed.
“He was taken to hospital where his injuries were deemed to not be life-threatening or life-changing.
“No arrests have been made at this stage and investigations remain ongoing.
“Anyone with information is asked to contact 101 or ‘X’@METCC and quote 7935/30JUNE.”
A London Ambulance Service spokesperson said: “We were called at 8.23pm yesterday (30 June) to reports of a stabbing in Kilburn High Road, NW6.
“We sent an ambulance crew, paramedics in fast response cars and an incident response officer to the scene. We also dispatched London’s Air Ambulance.
“We treated a patient at the scene and took him to a major trauma centre by road.”
