Biopesticides, derived from plants and algae, offer a sustainable alternative to conventional agrochemicals. They are eco-friendly, less toxic, and effective against pests without harming beneficial organisms. This review evaluates the potential of plants and algae as sources of biopesticides, their geographical distribution, target pests, mode of action, and commercial viability. Plants such as Anethum sowa, Thymus vulgaris, and Syzygium aromaticum, along with algae like Cladophora glomerata and Laurencia pinnata, are rich in bioactive compounds that can control pests. Essential oils from plants like cinnamon and clove have shown antifungal and insecticidal properties. Algae, particularly marine macroalgae, produce bioactive compounds that can inhibit pests and pathogens. Nano-biopesticides, which utilize nanotechnology, offer enhanced effectiveness and reduced environmental impact. Commercially available biopesticides derived from plants and algae are biodegradable and safe, with applications in pest control and reducing chemical pesticide use. The review highlights the potential of biopesticides in sustainable agriculture, emphasizing their role in reducing environmental hazards and promoting ecological balance. Future research should focus on improving the efficiency and scalability of biopesticides to meet global agricultural demands.Biopesticides, derived from plants and algae, offer a sustainable alternative to conventional agrochemicals. They are eco-friendly, less toxic, and effective against pests without harming beneficial organisms. This review evaluates the potential of plants and algae as sources of biopesticides, their geographical distribution, target pests, mode of action, and commercial viability. Plants such as Anethum sowa, Thymus vulgaris, and Syzygium aromaticum, along with algae like Cladophora glomerata and Laurencia pinnata, are rich in bioactive compounds that can control pests. Essential oils from plants like cinnamon and clove have shown antifungal and insecticidal properties. Algae, particularly marine macroalgae, produce bioactive compounds that can inhibit pests and pathogens. Nano-biopesticides, which utilize nanotechnology, offer enhanced effectiveness and reduced environmental impact. Commercially available biopesticides derived from plants and algae are biodegradable and safe, with applications in pest control and reducing chemical pesticide use. The review highlights the potential of biopesticides in sustainable agriculture, emphasizing their role in reducing environmental hazards and promoting ecological balance. Future research should focus on improving the efficiency and scalability of biopesticides to meet global agricultural demands.