Quality Management System (QMS) plays a critical role in ensuring effective regulatory compliance within pharmaceutical, biotechnology, and medical device industries. Regulatory agencies such as the U.S. Food and Drug Administration, International Organization for Standardization, and other global health authorities mandate the implementation of robust QMS frameworks to maintain product quality, safety, efficacy, and data integrity throughout the product lifecycle. A well-established QMS integrates essential elements such as document control, corrective and preventive action (CAPA), risk management, training management, supplier qualification, internal audits, validation, and continuous improvement. These components collectively support Good Manufacturing Practices (GMP) and facilitate compliance with evolving regulatory expectations. Effective QMS implementation minimizes deviations, reduces regulatory observations and warning letters, enhances inspection readiness, and promotes patient safety. Furthermore, the adoption of risk-based approaches and digital quality systems has strengthened organizational capability to achieve sustainable compliance and operational excellence. This review article highlights the major roles of QMS in regulatory compliance, discusses key system components, and emphasizes the importance of continuous quality improvement in achieving global regulatory standards