Leaderly acts and practices from unexpected places are often overlooked and yet have remarkable power. These spontaneous acts are in sharp contrast to those of formal leaders in governments and leading corporations. Global events like the Covid-19 pandemic and the climate crisis light up these differences. This book delves deeper, exploring these leaderly acts and practices more fully and beyond extraordinary events. The authors describe these as "unleadership", a term defined in this book as a set of acts and practices that are undertaken in a spirit of spontaneity and generosity for social good. Four dimensions of unleadership are identified in this book: paying it forward, living with the unknown, catching the wave, and confident connecting and collaborating. Unleadership exposes the potential that is unleashed when members of the community discover their own power to act and reclaim what they have delegated to their leaders. Based on extensive research, the authors highlight the flourishing of alternative forms of leading that encourage rethinking ideas of leadership and followership. They provide practical guidance to organisations and practitioners for enriching their leaderly capacity and cultivating unleadership practices to co-exist with and complement leadership practices. Unleadership is an invaluable resource for leaders and managers in public and private organisations as well as students of leadership and organisational development.