Lean Construction is a systematic approach adapted from lean manufacturing principles to improve performance, reduce waste, optimize resources, and enhance value in construction projects. In traditional construction management, inefficiencies such as rework, schedule delays, and cost overruns are common. Lean Construction techniques — including the Last Planner System (LPS), Just-in-Time delivery, pull scheduling, and waste elimination — focus on minimizing non-value-adding activities and fostering collaborative workflows. This study reviews Lean principles and analyzes outcomes from real implementations, showing measurable benefits including improved planning, time savings, cost control, and increased stakeholder satisfaction. The paper concludes that Lean Construction significantly improves efficiency and project outcomes when properly implemented.