A school student died while a school bus the child was riding on skidded off the road in Chitraban Municipality-6 of the district on Friday afternoon.
Details of the accident, including identity of the child, are yet to be established, said Chitwan District Police.
As many as 40 students of the Janapriya Boarding School were on the bus, police added.
The accident left 36 children injured and they are undergoing treatment at various health facilities in the district.
The bus was carrying students back home from the school.
The incident occurred at around 4:15 pm, police said.
The incident site is 30 km west from the district Headquarters Bharatpur.