The victim was a student of class three of the school at Belpadar, run by Tribal and Rural Development department of the state.
The girl died under mysterious circumstances as she allegedly hanged herself by using a bedsheet, said Ganeswar Bharimala, the District Welfare Officer (DWO), Kandhamal.
The victim was identified as Tulasha Kanhar, a tribal girl, who had appeared for her drawing examination earlier in the morning.
The girl was taken to the District Headquarters Hospital (DHH) at Phulbani where doctors decalred her brought dead.
The girl's father, this afternoon, lodged an FIR with the Phulbani Sadar police station alleging murder of his daughter and demanded an impartial investigation.