Resource management and environmental sustainability are both threatened by the extensive disposal of food and fisheries wastes. The potential for obtaining value-added wastes through scientifically informed composting and nutrient recovery processes was thoroughly investigated in this work, which showed how fishery and food wastes from restaurants, supermarkets, and mixed food wastes sources can be converted into natural fertilizers. This study explores the transformation of fishery and food waste into sustainable organic fertilizer. Waste samples were collected from supermarkets, restaurants, and mixed food sources, processed through drying and grinding, and analyzed for nutrients content (NPK). The work highlights the environmental and agricultural benefits of converting organic waste into fertilizers. The plant growth with fertilizer sourced from fish markets demonstrated the best growth, followed by fertilizer from restaurant. No significant change in pH after 4 weeks of soil assessment. This study demonstrates that the valorization of fishery and food wastes into compost fertilizers offers a viable, environmentally conscious solution to the growing challenge of organic waste management. The findings advocate for continued investment in organic waste utilization technologies, policy support for decentralized composting systems, and the promotion of circular bioeconomy models in agriculture. As global food systems strive to meet sustainability benchmarks, such innovations hold immense potential to reshape waste management practices, reinforce soil fertility, and enhance the resilience of agricultural communities.