Emergency services were called to Kilburn High Road at 3.30pm on Tuesday following reports of a stabbing.
Officers and ambulance crews found a man believed to be aged 40 suffering from stab wounds, Scotland Yard said.
He was taken by London Air Ambulance to a central London hospital for treatment where he remains in a stable condition.
The Met said: βHis injuries are not believed to be life-threatening.β
No arrests have been made. Enquiries continue.
Anyone with information concerning this incident is asked to call police on 101 quote CAD 4546/20Feb.
People can also call Crimestoppers anonymously on 0800 555 111 or tweet information to @MetCC
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