This document provides an overview of classical organizational theory, including its key theorists and approaches. It discusses the three main types of organizational theory, then focuses on classical theory. The six main pillars of classical theory are described as division of labor, departmentalization, coordination, scalar and functional processes, structure, and span of control. Criticisms of classical theory are outlined. The document also summarizes the approaches of three influential classical theorists: Taylor's scientific management, Weber's bureaucratic model, and Fayol's administrative theory. It concludes with references.