Graham Roger Serjeant CMG (born 1938) is a British medical researcher who studied sickle-cell disease in Jamaica, setting up screening programmes and a cohort study from birth. He directed the MRC Laboratories at the University of the West Indies and instituted the Sickle Cell Trust (Jamaica), a local charity. He has written four books and approximately 500 papers on sickle-cell disease. His work addressed the variability of sickle-cell disease with special emphasis on developing low-cost models of management suitable to countries with large numbers of patients and limited resources.