The incident happened at about 9.50am on Archway Road near the junction of Langdon Park Road.
Two ambulances as well as London's Air Ambulance attended.
A London Ambulance Service spokeswoman said:
“Despite extensive efforts from our staff, sadly a man reported to be in his 40s was pronounced dead at the scene.”
He is the sixth cyclist to be killed in London this year.
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The 20-year-old was found fatally wounded on Roth Walk, near Finsbury Park, north London at around 3am on Saturday, Scotland Yard said.
Police have arrested a man wanted in connection with a burglary at the home of pensioner Richard Osborn-Brooks.
The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants