Non-Contact Infrared Thermography (NCIT) has emerged as a promising tool for Type 2 Diabetes Mellitus (T2DM) diagnosis due to its non-invasive nature and ability to detect physiological changes in skin temperature associated with diabetes-related complications. This review synthesizes current literature on NCIT applications in T2DM diagnosis, highlighting its potential advantages over traditional methods such as blood glucose testing and invasive procedures. Key findings indicate that NCIT can detect early vascular changes and neuropathies, offering a rapid and cost-effective screening method. Challenges including standardization of protocols and variability in environmental conditions are also discussed. Future research directions focus on enhancing NCIT's sensitivity and specificity through advanced image processing techniques and large-scale clinical trials. NCIT shows promise in revolutionizing T2DM management by enabling early detection and proactive intervention, thereby improving patient outcomes and reducing healthcare costs.