This chapter highlights into how nanoparticles can be creatively used in textiles to regulate temperature. Nanoparticles possess distinct characteristics that can be utilized to improve the way textiles manage heat, offering warmth or cooling depending on the circumstances. The chapter discusses various types of nanoparticles used for thermal regulation, including metallic nanoparticles, phase change materials, and carbon-based nanoparticles. It examines the mechanisms by which nanoparticles interact with heat and how they can be incorporated into textile materials to optimize thermal comfort. Additionally, the chapter explores the potential benefits of nanoparticle-enhanced textiles in various applications, from outdoor apparel to medical garments.