The Elgar Companion to Social Capital and Health brings together work from a wide variety of social science disciplines that have been attracted to the promise and the problems of social capital: sociology, political science, economics, epidemiology, psychology, and neurology. Contributors to the Companion come from wide geographic areas of Europe and North America as well as the Middle East. Most of the Companion chapters focus on the theoretical or empirical content of social capital issues. Several, however, will benefit those curious about social capital per se. We believe that a side benefit of this diverse collection is the opportunity to compare different analytical approaches of various disciplines and cultures.