This chapter examines various “types of organizations” (and subtypes within each) as an important issue for scholars because of the evolving and expanding nature of organizational types. It begins with a review of major existing types of organizations - including for-profits, nonprofits, benefit corporations, government/ public, etc. Two other broad approaches to understanding types of organizations are then presented. First, hidden/clandestine organizations represent a less visible type of collective found in various parts of society that may differ in key ways from more visible forms. Second, a range of other alternative organizational types that depart in significant ways from traditional forms are discussed (e.g., cooperatives, decentralized autonomous organizations, temporary organizations, etc.). The chapter concludes with a brief discussion about future work in our field around the topic of organizational types.