Sierra Leone successfully completed a nationwide Measles and Rubella (MR) Supplementary Immunization campaign, achieving 99% coverage of the targeted population, according to administrative data. This campaign, which focused on children aged 9 to 59 months, resulted in the vaccination of 1,336,845 children. Notably, the campaign also identified and vaccinated 16,132 zero-dose children who had previously missed out on essential vaccinations.