There is a large shortage of affordable housing across Europe. In high-demand urban areas housing shortages lead to unaffordable prices for many target groups. This book explores innovations to support a sufficient supply of affordable and sustainable rental housing.Affordable housing is increasingly developed, financed and managed by a mix of market, state, third sector and community actors. Recent decades in large parts of the Western world have consecutively shown state-dominated, non-profit housing sectors, an increased role for market forces and the private sector, and the rise of initiatives by citizens and local communities. The variety of hybrid governance and finance arrangements is predicted to increase further, leading to new affordable housing delivery and management models. This book explores these innovations, with a focus on developments across Europe, and comparative chapters from the USA and Australia. The book presents new thinking in collaborative housing, co-production and accompanying finance mechanisms in order to support the quantity and the quality of affordable rental housing.Combining academic robustness with practical relevance, chapters are written by renowned housing researchers in collaboration with practitioners from the housing sector. The book not only presents, compares and contrasts affordable housing solutions, but also explores the transferability of innovations to other countries. The book is essential reading for researchers and professionals in housing, social policy, urban planning and finance.