The busy high street was closed by the police as ambulances and the fire service arrived at the scene.
The nature of the incident is not yet known, with details yet to be confirmed by the emergency services.
Pictures show the man standing precariously on the head of a window at the junction of Palmerston Road and Kilburn High Road.
A video shared on social media shows him being pulled in through the window by officers.
Kilburn High Road is no longer being reported as closed by the AA.
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