The present paper develops a model of moral engagement to explain social entrepreneurs’ motivation. The fundamental premise of the model is that three deontic principles, moral outrage, moral obligation, and personal responsibility influence social entrepreneurs’ motivation to start social ventures. The paper uses the examples of two social entrepreneurs, Mohammad Yunus of the Grameen Bank and 2006 Nobel Peace Laureate, and Victoria Hale of OneWorldHealth Institute to illustrate model of moral engagement. The model’s implications for research and management practice are discussed.