Book excerpt: Inequality and innovation are both rising issues on the international development agenda. Their intersection is inclusive innovation; defined as the inclusion within some aspect of innovation of groups who are currently marginalised. This is a topic of increasing interest and activity. Large firms have been working to deliver innovative goods and services for base-of-the-pyramid consumers: the c.3 billion who live on less than US$2 per day. Within poor communities, an influx of new technology, finance and capabilities has spurred more localised innovation. A variety of different models have been identified by which this activity is organised and implemented, such as inclusive innovation clusters, grassroots innovation, frugal innovation, innovation platforms, and inclusive user-producer interactions. This book explores the operation, conceptualisation and impact of these models, and analyses the nature of inclusive innovation practice and research. It will be of interest to researchers, policy-makers, strategists and other practitioners associated with these new forms of innovation. This book was originally published as a special issue of Innovation and Development.