Reducing the cost of the space programme interests people more and more, due to the concerns of budget limitation and commercialization of space technology. The Proceedings of the 3rd International Symposium on Reducing the Cost of Spacecraft Ground Systems and Operations bring together papers contributed by authors representing the research organizations, academic institutions and commercial sectors of ten countries around the world. The papers encompass the subject areas within mission planning and operation, TT&C systems, mission control centres, and small satellite support, highlighting the issues concerning researchers and engineers involved in a wide range of space programmes and space industries.