The 2010 Sierra Leone Multiple Indicator Cluster Survey (MICS4) is a nationally representative survey of households, women, and children. The main objectives of the survey are (i) to provide current information for assessing the present situation of women and children in Sierra Leone-including the identification of vulnerable groups and of disparities among groups-in order to inform policies and interventions; (ii) to produce data to monitor progress toward the achievement of targets and goals that include the Millennium Development Goals (MDGs) and World Fit For Children; and, (iii) to contribute to the improvement of national statistical, data and monitoring systems in Sierra Leone and to strengthen national capacity and technical expertise in the design and implementation of such systems. Interviews were successfully completed in 11,394 households drawn from all districts of Sierra Leone.