The victims were returning here from Berhampur in Ganjam district after the ceremony when the incident happened at Turiberna, 10 km from their house, Rourkela sub-divisional police officer Tushar Jena said.
Besides the couple, other victims included two sisters of the bride, the driver of the car, a photographer and another person.
The groom's elder brother and his sister-in-law were critically injured and are battling for their lives at the Ispat General Hospital here, police said.