Emergency services, including the air ambulance, were called to the Edenmore Road area of Limavady at around 3.50 pm.
Police said the young boy was riding a bike at the time of the crash with another vehicle.
The driver of the vehicle was spoken to at the scene, police said.
A PSNI spokesperson added: “Enquiries are ongoing and anyone who witnessed the collision or who has dashcam footage is asked to contact police in Limavady on the 101 number.”
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