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The Corporate Entrepreneurship (CE) of firms and enterprises is the subject of current research in the fields of management and business. However, analyses on this subject in agricultural firms are lacking. The purpose of this research was to study the relationships between corporate entrepreneurship and firm performance in Agricultural Small and Medium-sized Enterprises (ASMEs) in Iran. Specifically, the authors aimed to analyze how knowledge creation and learning orientation as a mediator influence the relationship between corporate entrepreneurship and firm performance. A conceptual model was designed and hypotheses were constructed. The samples in this study were owners and/or top managers of ASMEs. Data for the study were collected using a questionnaire survey administrated during 2015. In order to test the hypotheses, data were collected from ASME and analyzed using the structural equation model by AMOS20 graphic software. The results reveal that corporate entrepreneurship significantly influences learning orientation, knowledge creation and firm performance in ASMEs. The most notable outcome of these findings is that knowledge creation and learning orientation performs a mediating role in the relationships between corporate entrepreneurship and performance in ASMEs.