Many volunteers in nonprofit organizations begin with great excitement, but quickly lose interest and leave. This may be due to poor management practices that decrease motivation, and consequently increase volunteers' dropout. This in turn threatens the sustainability of any nonprofit organization. Therefore, volunteer-based organizations have to invest more in volunteer retention. Management of volunteers differs from the management of paid employees. Hence, the management practices that suit volunteers vary from those used for managing paid employees. Thus, human resources management practices were applied on volunteers including volunteer recruitment, training and recognition. However, the amount of available research focusing on this topic is still limited. This research aims to develop a model to understand the relationship between volunteer management practices and volunteer retention through volunteer motivation. To achieve the research objective, first the literature concerning the three variables was reviewed. Next, the relationships between these variables were reviewed from related studies. Finally, a conceptual model was developed based on the existing theories.