<p>Autoimmune diseases pose a significant challenge to modern medicine due to their complicated and poorly understood mechanisms, which hinder effective diagnosis and treatment. The rising global incidence of autoimmune disorders is projected to place increasing strain on healthcare systems and financial resources. In response, nanotechnology has emerged as a promising avenue for both the diagnosis and treatment of these conditions. Among various nano-technological approaches, nanoparticles have garnered particular attention due to their advantageous properties including biocompatibility, enhanced drug bioavailability and efficient permeability across biological membranes. Furthermore, their unique characteristics such as magnetic responsiveness, anti-inflammatory, and antimicrobial capabilities, enable precise drug delivery and improved therapeutic outcomes, as well as the potential for earlier disease detection. Despite these promising developments, the clinical translation of nanoparticle-based strategies faces challenges including concerns regarding their stability in vivo and the need for further research to validate their safety and efficacy. While current diagnostic tools remain limited, certain nanoparticles have already received approval from the US Food and Drug Administration, demonstrating their potential for clinical application. This review aims to highlight the recent advances in use of nanoparticles for the diagnosis and treatment of autoimmune diseases, and to explore their prospective role in future clinical practice.</p>