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.
More top news
British astronaut Tim Peake takes part in a test to see how a Mars rover handles when it's controlled from further away.
Jack Susianta, a 17-year-old student, died on July 29 2015 after jumping into the River Lee in east London.
Health inspectors found listeria, salmonella, ecoli and even potentially deadly listeria.