Bonding agents are auxiliary but critical additives in composite propellants. The bonding agent ameliorates the processing and mechanical performance of propellant through interfacial interaction between particulate fillers and binder matrix. Several bonding agents have been developed over the years to treat the dewetting problem of the composite solid propellant. In this review, we describe the different types of bonding agents, their bonding mechanism and development in the composite propellants. An individual bonding agent is discussed critically in terms of its strengths and weaknesses. The review provides an understanding of the developments of the bonding agent in the field of composite solid propellants.