This paper contributes to the growing social science scholarship on organic agriculture in the global South. A “boundary” framework is used to understand how negotiation among socially and geographically disparate social worlds (e.g., non-governmental organizations (NGOs), foreign donors, agricultural researchers, and small-scale farmers) has resulted in the diffusion of non-certified organic agriculture in Kenya. National and local NGOs dedicated to organic agriculture promotion, training, research, and outreach are conceptualized as “boundary organizations.” Situated at the intersection of multiple social worlds, these (...) NGOs engage in “strategic bridge building” and “strategic boundary-work.” Strategic bridge building involves the creation and use of “boundary objects” and “hybrid forms” that serve as meeting grounds for otherwise disconnected social worlds. Strategic boundary-work involves efforts to “scientize,” and thereby legitimize, organic agriculture in the eyes of foreign donors, potential research collaborators, the Kenyan state, and farmers. Examples of strategic bridge building and boundary-work are presented in the paper. The Kenyan case illustrates that different social actors can unite around a shared objective – namely, the promotion and legitimization of organic agriculture as an alternative to the Green Revolution (GR) technological package. (shrink)