This lecture provides an introductory overview of major topics that have been investigated in the field of environmental psychology. Environmental psychology is broadly defined as the study of people’s relationships with their everyday social and physical surroundings. People’s everyday environments include their homes, neighborhoods, classrooms, workplaces, health care settings, community public spaces, as well as more remote regional and global influences on their lives. These environments encompass both built (or human-designed) and natural elements, and in many instances, both place-based and virtual features. Among the research topics discussed in this lecture are the behavioral and health effects of “tight spaces” and dysfunctional architecture, urban stressors (including high levels of noise, population density, and traffic congestion), and the restorative capacity of natural environments to reduce psychological and physiological stress. Also examined are key processes that affect individuals’ and groups’ responses to their surroundings—for example, their spatial cognition, environmental personalization and territorial behavior, personal space, privacy regulation, information overload and “continuous partial attention”. Finally, the interdependence between global environmental conditions and people’s experiences of their local place-based environments is discussed.