Plant-based nanotechnology is an emerging field that integrates sustainable nanomaterialsNanomaterials derived from plant sources with biological systems. This chapter focuses on the convergence of plant-based nanotechnology and proteinProteins communication, providing insights into sustainable applications in agriculture and healthcareHealthcare. It emphasizes plant-derived nanoparticles (PNPs) as an eco-friendly substitute for synthetic materials, highlighting their biocompatibilityBiocompatibility, diverse functionalities, and environmentally friendly synthesis techniques. Simultaneously, the chapter discusses plant proteinProteins communication, mediated through structures such as plasmodesmata and glutamate receptor-like proteinsProteins (GLRs), which regulate essential physiological processes, including nutrient signaling, defense mechanisms, growth, and adaptation to environmental changes. The interaction between these domains is explored, showing how nanotechnology can improve agricultural efficiency by enhancing photosynthesisPhotosynthesis, nutrient uptake, stress toleranceTolerance, and developing novel crop protection strategies such as nanofertilizers and nanopesticides. In the healthcareHealthcare sector, PNPs offer promising solutions for targeted drug delivery, cancer therapy, antimicrobial treatments, and wound healing due to their biodegradability and low toxicity. Overall, this chapter highlights the potential of integrating plant-based nanotechnology with proteinProteins communication to develop innovative strategies for improving plant health and human well-being, contributing to sustainable development goals.