Over the last decade, explicit emphasis on the creation of social value has grown in profit-seeking firms as well as nonprofits and has even led to the emergence of a new legal organizational classification known as for-benefit corporations. Like financial value, social value is dynamic and therefore subject to perpetual changes in the firm’s external environment, changes that yield opportunities and threats for the firm. Although social entrepreneurship researchers have begun to study the identification and exploitation of opportunities to create social value, this research has taken place primarily within the context of startup organizations. In contrast, corporate entrepreneurship research has emphasized value creation within existing firms, but focused primarily on the identification and exploitation of opportunities to create financial value. Combining the two, we examine the creation of social value within the firm by proposing the social corporate entrepreneurship scale (SCES), a new instrument that measures organizational antecedents for social corporate entrepreneurship and offers managers an opportunity to analyze whether the perceived environment is supportive of corporate entrepreneurial behaviors intended to create social as well as financial value. The article concludes with a discussion of the instrument’s potential contribution to managerial practice