Research on organizational knowledge transfer is burgeoning, yet our understanding of organizational antecedents and consequences remains rather unclear. Although there have been conceptual and qualitative reviews of the organizational knowledge transfer literature, no study has attempted to summarize the quantitative findings present in the large body of empirical research. By using meta-analytic techniques to summarize relationships between organizational antecedents, inter- and intraorganizational knowledge transfer, and important consequences, this study represents a first step toward that goal. We provide a more comprehensive understanding of knowledge transfer processes by uncovering how knowledge transfer processes unfold at different levels of analysis. In this sense, our study does not only reveal new insights into levers and outcomes of organizational knowledge transfer, but also provides new insights into particularities of transfer processes between organizations and between units within organizations.