Nanofertilizers represent a promising advancement in agricultural technology, offering enhanced efficiency in plant disease management. This chapter explores the potential of nanofertilizers in mitigating plant diseases, their sources, and their broader impact on sustainable agriculture. By incorporating nanoparticles, nanofertilizers provide targeted nutrient delivery, improving plant health and resilience against pathogens. Their unique properties, such as increased surface area and reactivity, enable better nutrient absorption and utilization, reducing the need for conventional fertilizers and minimizing environmental impact. Various sources of nanofertilizers include natural minerals, bio-wastes, and synthesized nanoparticles, each contributing distinct advantages in terms of nutrient composition and release mechanisms. The impact of nanofertilizers extends beyond improved disease resistance, encompassing enhanced crop yields, reduced chemical inputs, and lower greenhouse gas emissions. This approach aligns with the principles of precision agriculture, promoting resource efficiency and sustainability. However, understanding the interactions between nanomaterials and plant systems, along with their long-term ecological effects, remains crucial. Future research should focus on optimizing formulations, evaluating safety, and developing regulatory frameworks to ensure the responsible use of nanofertilizers. Harnessing the potential of nanofertilizers for effective plant disease management holds significant promise for transforming agricultural practices and achieving global food security.