Social marketing has been employed by nonprofit organizations in a variety of public issues to enhance change and improvement of society. However, there is little research on the employment of social marketing in museums, especially in the field of collection acquisitions. This paper takes the "The Radio Exhibition and Radio Acquisition Activity", held in the National Science and Technology Museum (NSTM), as a case study, as it aimed at acquiring donated objects for the museum's collection from the general public through social marketing. This paper illustrates the planning, implementation as well as evaluation of the social marketing activity. The research results showed that donors' motivations comprise of an acknowledgement of the value of museums, altruistic to society and national identity. In addition, this social marketing activity successfully influences the target audiences to donate objects for museum's collection.