This study aims to empirically investigate the determinants of dollarization in Sierra. It uses quarterly data from 1992Q1 to 2017Q4 and autoregressive distributed lag Bound Testing technique. Both the long and short run results revealed that inflation, exchange rate depreciation, financial deepening and war dummy were the main determinants of dollarization in Sierra Leone during the study period. The error correction term depicts that 53 percent of any disequilibrium in dollarization will be corrected within a year. A key policy recommendation is that policy makers should implement prudent policies that will ensure broader macroeconomic stability (including price stability and exchange rate stability) as a recipe for de-dollarization in Sierra Leone.