Nitish Kumar was born on 1 March 1951 in Bakhtiarpur, Bihar. His native village is Kalyan Bigha in Nalanda district. His father, Kaviraj Ram Lakhan Singh, was an Ayurvedic practitioner, and his mother was Parmeshwari Devi. He is affectionately known as "Munna".
He earned a degree in electrical engineering from Bihar College of Engineering (now NIT Patna) in 1972 and joined the Bihar State Electricity Board before turning to politics.