Ranasinghe Premadasa was born at Colombo on 23 June 1924.His father was Richard Ranasinghe and mother was Jayasinghe Arachchige Ensina Hamine, Horana. R.Premadasa the oldest of five children, three sisters, and one brother. Ranasinge family was a family of modest means, as such his political rise was resented by some of his rivals from the two or three Rajaka. His paternal side belong’s to Dhobies, Wasermans caste families who had inherited political power, during and post British colonial rule.
He attended St Joseph’s College, Colombo which at that time had started an oriental languages course.