Tun Abdul Razak was descended from a long line of Pahang chieftains of Bugis descent.[3][4] He was married to Tun Rahah Mohammad Noah; daughter of Tan Sri Haji Mohamad Noah Omar, the former Minister of Home Affairs and first Speaker of the Dewan Rakyat. He was the brother in law of Tun Hussein Onn, his successor as Prime Minister, who also married another Tan Sri Haji Mohamad Noah Omar's daughter, Tun Suhaila Mohamad Noah.
Abdul Razak's eldest son, Najib Razak, became the 6th Prime Minister of Malaysia on 3 April 2009, succeeding Abdullah Badawi. He has four other sons, Datuk Ahmad Johari Razak, Mohamed Nizam, Mohamed Nazim and Mohamed Nazir.