This book provides an in-depth overview of today's international cooperation in space science, with highlights on space science satellite programs. Unlike application satellites, data from space science satellites is open to global scientists for joint participation and analysis. Therefore, international cooperation is often involved in the proposal, selection, and implementation of space science programs. The book provides a comprehensive introduction to the importance of international cooperation in space science programs, their funding sources and stakeholders, the elements needed for successful cooperation, different forms of cooperation, legal issues to consider, and international cooperation organizations. It also presents several important examples of international cooperation and looks ahead to the future development of international cooperation. This book is aimed at scientists and engineering teams directly involved in space science satellite programs, government departments managing space science missions, and young students aspiring to a career in space science.