In Jagatsinghpur district three farmers were killed and four others seriously injured when lightning struck them at Nimakala village.
The farmers had taken shelter under a tree during rains when lightning struck them, the police said adding the injured were sent to hospital.
A report from Kendrapara district said a 68-year-old farmer was killed in lightning when he was ploughing his field in Gogua village.
A 15-year-old boy was injured in the same village, police said.
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In other incidents, three persons were injured in lightning at Ostia, Alava and Belatala villages in Kendrapara district, he added.
In Bhadrak district, a 14-year-old girl of Sathibakuda village was killed when lightning struck her when she was returning home from school, while a farmer was killed at Dikshitpada village in Cuttack district when he was working in his paddy field.
Another farmer was killed at Patilo village in Keonjhar district in a similar incident, the police said.