In the current era of never-ending change, effective library organizations must be nimble and flexible. Formal committee structures and reporting lines often get in the way of making changes quickly and may not provide opportunities for leadership development. Communities of Practice (CoPs), as realized at Arizona State University Libraries, provide a flexible model to gather employees from diverse areas and levels of an organization to address a common interest, project or problem. The issues and projects addressed by CoPs at ASU Libraries have benefited overall organizational dynamics and promoted management/staff interpersonal relations, leadership skills, self-awareness, and increased involvement from employees of all areas. Many who participate in these groups go on to participate in further leadership roles in formal groups within the organization. In this workshop, participants will learn about CoPs as an organizational and leadership development resource, including discussion of the theory behind the practice, resources useful for these collaborative working groups and an interactive discussion break-out time for an opportunity to consider how such groups might work in individual organizations.