Nanotechnology has revolutionized biomedical engineering by providing innovative solutions for disease diagnosis, treatment, and regenerative medicine. Its ability to manipulate materials at the nanoscale allows for precision in targeting, monitoring, and therapeutic intervention. This paper explores three transformative applications of nanotechnology: targeted drug delivery, biosensors, and tissue regeneration. In drug delivery, nanoparticles improve bioavailability, reduce side effects, and enable site-specific therapy. Nanobiosensors enhance real-time disease detection through ultrasensitive and selective mechanisms. In tissue engineering, nanomaterials provide scaffolds that mimic the extracellular matrix, accelerating healing and regeneration. Despite challenges in toxicity, scalability, and regulatory approval, nanotechnology holds immense potential to reshape healthcare. This study highlights recent advances, challenges, and opportunities in integrating nanotechnology with biomedical engineering to build safer, more effective, and patient-centered medical technologies.