This chapter examines the following concepts: process overview, resin infusion technologies, equipment and process parameters, pre-form technology for infusion, resin characteristics, core and flow media materials, part design for resin infusion, centrifugal casting. Besides being the best known of the many resin infusion technologies for making composite parts, resin transfer molding (RTM) is often the general term used for all resin infusion processes. However, in this text, RTM is used in a more narrow sense and resin infusion is the more general term. Another phrase occasionally used to describe the resin infusion processes is liquid molding processes. Resin infusion can be compared with other composite molding processes to determine the relative costs and production capabilities.