Sierra Leone, in West Africa, is one of the poorest developing countries in the world. Sierra Leone has experienced several recent challenges namely, a civil war from 1991 to 2002, a massive Ebola outbreak from 2014 to 2016, followed by floods and landslides in 2017.In this study, we quantified the burden of disease in Sierra Leone over a 27-year period, from 1990 to 2017. In this descriptive study, we analysed secondary data from the Institute of Health Metrics and Evaluation, Global Burden of Disease (GBD) study. We quantified patterns of burden of disease, injuries, and risk factors in Sierra Leone. We report GBD data and metrics including mortality rates, years of life lost and risk factors for all ages and both sexes from 1990 to 2017. From 1990 to 2017, trends of mortality rates for all ages and sexes have declined in Sierra Leone although mortality rates remain some of the highest when compared to other developing countries. The burden of communicable, maternal, neonatal, and nu