The OpenStreetMap Sierra Leone is a registered community based organization in Freetown, Sierra Leone. It focuses on the creation and use of open data to manage and solve social, economic and community challenges. It aims to do so through collaboration with local and international organizations and sharing open data techniques.

The organization currently consists of 0ver 25 active members with almost half of the sum being women. Since its establishment in 2017, the organization has helped in numerous mapping activities through its members. It has coordinated the establishment of 5 YouthMappers Chapters