Najib is the eldest of Abdul Razak's six sons (the other four being Nizam, Nazim, Nazir, Nazri Aziz and Johari),his younger brother, Nazir Abdul Razak, runs the country's second-largest lender, Bumiputera-Commerce Holdings Bhd the second Prime Minister of Malaysia, and a nephew of Hussein Onn, the third Prime Minister of Malaysia, Najib is regarded as a political blue blood. He was first married to Tengku Puteri Zainah Tengku Eskandar; but is currently married to Datin Seri Rosmah Mansor. He has four sons, Kenneth Eswaran, Nizar (born 1978), Nazifuddin and Norashman, and four daughters, Siti Norhaliza, Puteri Norlisa, Pangiran Nur Jafri and Nooryana Najwa.
Najib received his primary and secondary education at St. John's Institution, Kuala Lumpur. He also attended renowned Malay College Kuala Kangsar, Malvern College, Worcestershire, England and subsequently attended the University of Nottingham, where he received a bachelor's degree in industrial economics in 1974.
Aged just 23, he became the youngest MP in Malaysian history, winning uncontested the Pekan constituency in the east coast state of Pahang after it fell vacant following the sudden death of his father.
A year later he became the youngest deputy minister and returned to state politics to become chief minister of Pahang, his home state, by the age of 29.
He later returned as MP and was appointed a full minister in 1987
Najib holds the title of Orang Kaya Inderapura Shahbandar of Pahang Darul Makmur.