The victims, identified as Putai Yadav (36) and Tulsi Viswakarma (40), were working in the field when rain accompanied by thunderbolt struck the area, officials said.
Both victims ran to take shelter under a tree, but were struck by lightning and were killed on the spot, they said.
The bodies have been sent to Sadar Hospital, Medininagar for post-mortem.
The Deputy Commissioner of Palamau, Amit Kumar has assured to provide compensation as per government provisions.