- NYENGEDI ENVIRONMENT DEVELOPMENT AND DISEASES CONTROL
- NYUKI WETU TANZANIA
- Oblige for Vulnerable Children Tanzania [OVCT]
- OCODE - Organization for Community Development
- OKOA COMMUNITY RELIEF SERVICES
- Old Nguvumali Women Centre
- One Light - Rwanda
- OpenSasa
- ORGANIZATION FOR LAND AND AGRICULTURE IMPROVEMENT
- Organization of People Empowerment (OPE)