Background: Frozen shoulder, also known as Adhesive capsulitis, is a common musculoskeletal disorder that causes discomfort, stiffness, and limited shoulder joint range of motion. This illness is managed using various Physiotherapy techniques such as electrotherapy modalities, manual therapy techniques, exercises, etc. Muscle Energy Technique (MET) is one of the manual therapy technique that have drawn attention as a possible treatment for enhancing shoulder mobility and lowering pain. The objective of this narrative review is to analyze the efficacy of MET in managing frozen shoulder by examining current evidence and discussing how it affects functional outcomes, range of motion, and pain relief. Methods: A thorough analysis of pertinent research and clinical trials on the effectiveness of MET in managing frozen shoulder was carried out. We looked through databases like PubMed, Scopus, and Google Scholar to find papers that had been published during the last 20 years. Reduction of discomfort, enhancement of shoulder mobility, and general functional recovery are among the important outcomes evaluated. Results: According to the research, MET helps people with frozen shoulder move their shoulders more freely, feel less discomfort, and perform better in their daily activities. The method increases flexibility and decreases stiffness by stretching the restricted tissues and facilitating joint movement through voluntary muscle contractions. MET seems to be more beneficial in encouraging active movement and neuromuscular control than passive stretching methods. Conclusion: MET is a potentially effective treatment strategy for frozen shoulder that enhances functional ability, range of motion, and pain alleviation. To create uniform procedures and ascertain its long-term efficacy, more excellent randomized controlled studies are necessary. For patients with frozen shoulder, combining MET with other physiotherapy treatments may result in the best results.