Pacific Island communities depend on healthy coastal ecosystems for food security, health, and livelihoods, yet climate change, pollution and shifting marine conditions are increasingly undermining these systems. Addressing APN’s priority on global change impacts on Pacific ecosystems and livelihoods, this project explores how seaweed – an ecologically important but underutilised resource – can strengthen resilience and support sustainable development. Focusing on Kiribati, Marshall Islands and the Solomon Islands, the project will assess seaweed, their environmental requirements, and their potential contributions to nutrition, biodiversity and culturally grounded livelihoods. It addresses gaps in nutritional data, value-adding capacity, policy support and community-led governance, while integrating scientific research with traditional ecological knowledge. The project will co-develop pathways for climate-resilient seaweed use that enhance food and nutrient security, diversify income, support women and youth, and contribute to healthy coastal ecosystems under accelerating global change.