The incident occurred yesterday, when a marriage party was on their way to Pauri Garhwal in Uttarakhand from Gurgaon in Haryana in the car, they said.
The driver of the car lost control over the vehicle which then overturned and rammed into the tree, police said.
The victim has been identified as Narendra Singh, the cousin of the bridegroom, they said.
The four injured were admitted to a hospital, they said.