Officers and London Ambulance Service attended and the male was pronounced dead at the scene.
A Met Police spokesman said: "Police were called at approximately 23:10hrs on Monday, 12 August to reports of a male stabbed in Munster Square, NW1.
Comment: RT is reporting that he was hacked to death with a machete. And that his assailants laughed all the way through it.
"A crime scene remains in place.
"No arrests; enquiries into the circumstances remain ongoing."
The stabbing comes a police officer was left in critical condition after being scalped by a machete in east London on August 8.
The officer was conducting a routine traffic stop in Coopers Lane junction with Leyton High Road before being assaulted.
The suspect, believed to be in his fifties was subdued with a taser.
London Mayor Sadiq Khan said it was an "appalling" attack.
Previous Home Secretary, Sajid Javid, has vowed to tackle the problem and treat violent crime as a "disease".
While London Mayor Sadiq Khan has created a violent crime reduction unit with a focus on tackling the problem, which he partly attributes to Tory cuts in policing.
Amid the turmoil on UK streets Prime Minister Boris Johnson will today unveil measures to put more police officers on the beat.
The plan to recruit an extra 20,000 police officers will begin within weeks and an urgent review will take place of plans to make it easier for forces to use stop-and-search powers.
Comment: And what did Khan, the utter tw*t, say in response to this latest knifing? Translation: "It's not their fault! They're POOR! Give them more money and they'll magically be cured of their criminal mindset!"