A man and his son and another person were killed in separate lightning strikes in Panchagarh on Monday.
Two other people were also killed in separate lightning strikes in Dinajpur and Nilphamari districts the same day.
Police said Mohammad Ali and his son Anisur Rahman were struck by lightning while they were harvesting paddy during rain at Bhojanpur in Tetulia upazila of Panchagarh on Monday, leaving them critically injured.
They were taken to the Sadar hospital where the doctors pronounced them dead.
Another person was also killed at Boda upazila as a thunderbolt hit him during rain.
Lightning strikes claim hundreds of lives in Bangladesh every year. The deaths mostly occur in a warmer period from March to July.