Lean design is considered one of the most important modern approaches adopted by Toyota in developing its industrial products. This concept is based on reducing waste and achieving the highest possible production efficiency while maintaining high quality standards. The system emerged within what is known as the “Toyota Production System,” which later became a global model studied in the fields of management, design, and industrial engineering. Lean design at Toyota is built on a fundamental principle: producing only what the market needs, at the right time, and with minimal consumption of materials, energy, and time. Therefore, the company carefully studies consumer needs before beginning the design process, helping it deliver vehicles characterized by efficiency, practicality, and aerodynamic aesthetics. This approach also aims to reduce complexity in mechanical components and exterior design while maintaining both functional and aesthetic performance. One of the most important characteristics of lean design at Toyota is its emphasis on continuous improvement, known as the “Kaizen” concept. Products are continuously developed based on feedback from workers and users. Every stage of design and production undergoes review and evaluation in order to identify errors and reduce waste. This has significantly contributed to improving the quality of Toyota vehicles and strengthening their competitiveness in global markets. Toyota has also applied lean design principles to hybrid and electric vehicles, such as the Toyota Prius, which became a successful example of combining modern technology with environmental sustainability. The vehicle was designed to reduce fuel consumption and harmful emissions while maintaining comfort and aerodynamic efficiency. The success of Toyota’s lean design approach was not solely the result of advanced technology, but also of the company’s culture of teamwork and precise organizational management. This methodology has become an inspiration for many industrial companies worldwide because it successfully balances quality, speed, and cost reduction. Therefore, lean design at Toyota can be considered a comprehensive model that combines modern managerial thinking with contemporary industrial creativity, reflecting the ability of design to achieve both sustainability and economic efficiency at the same time.