This textbook introduces readers to the idea of cooperation and mutualism. Cooperatives and mutuals are participatory organizations in which members participate in control and governance, receive economic benefits through patronage refunds or net income, and become owners through equity. These mutual-benefit organizations exist alongside non-profit organizations and investor-benefit organizations through the global economy. The central purpose of this textbook is to introduce the ideas of cooperation and mutualism. Consequently, it is likely to be used in an introductory course on cooperatives and mutuals as opposed to a graduate seminar course. As an economist, it stands to reason that much of my discussion is written through the eyes of economics. After all, a cooperative or mutual will not survive unless it achieves an economic purpose. Another goal of this text is to make it accessible, affordable, and easy to update.