This chapter primarily ties to SDG 2 (Zero Hunger) through its focus on algal peptides for sustainable crop improvement and agricultural applications. The research demonstrates how algal extracts and peptides can serve as eco-friendly biostimulants, biofertilizers, and biopesticides that enhance plant growth, stress tolerance, and resistance to diseases while reducing dependence on synthetic chemicals. The chapter also connects to SDG 15 (Life on Land) by promoting sustainable agricultural practices that improve soil health, enhance soil microbiome diversity, and support environmental protection through natural alternatives to toxic chemicals.