This document provides an introduction to organizational behavior. It defines organizational behavior as a field of study that examines how individuals, groups and structure influence behavior in organizations. It traces the origins of the field to the Industrial Revolution, scientific management, and the Hawthorne studies. It describes organizational behavior as interdisciplinary, applied, normative, and oriented toward organizational objectives. The roles and scope of organizational behavior include understanding and directing human behavior at individual, group, intergroup and organizational levels. Finally, it outlines the four main contributing disciplines to organizational behavior: psychology, sociology, social psychology, and anthropology.