In this study, impact of work climate and social network size on the volunteers’ motivation were investigated through the application of self-determination theory. This research type is applied and research method is Descriptive. In this study Active volunteers of Tehran Red Crescent Society were selected as Statistical population. Sample size was estimated 146 using Cochran Formula. Two stage Cluster sampling method used for sampling. For gathering data standard questionnaires were used. For testing hypotheses, Structural Equation Modeling (SEM) using LISREL software were employed. Results showed that the work climate has positive effect on volunteers autonomous and controlled motivation while the needs satisfaction acts as a mediator. Also the results showed that the social network size has positive effect on the volunteers’ autonomous motivation and negative effect on the volunteers’ controlled motivation and the needs satisfaction acts as a mediator of both impacts.

Keywords: Self-Determination Theory, Motivation, Needs Satisfaction, Work Climate, Social Network

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