Flooding in Osogbo Local Government has evolved into a recurring environmental and socio-political crisis, exacerbated by poor urban planning, inadequate drainage infrastructure, and weak institutional response. While physical mitigation measures remain essential, this conceptual paper explores the critical yet underutilised role of advocacy communication in curbing flooding and promoting public resilience. Drawing insights from 18 reviewed national and international studies, the paper demonstrates how strategic communication when participatory, culturally relevant, and media-driven can influence public behaviour, mobilise communities, and hold authorities accountable. Case studies across Nigeria, South Africa, Indonesia, Malaysia, and Australia provide evidence that the integration of traditional media, digital tools, storytelling, and coalition-building can transform environmental risk communication into an effective policy and community intervention tool. Using Participatory Communication Theory, the study positions advocacy communication as a transformative force in flood risk governance. The findings revealed the urgent need for a multidimensional advocacy framework that bridges public engagement, policy reform, and technological innovation to effectively address the flooding challenge in Osogbo and similar urban contexts.