The purpose of this study was to identify constraints to technology transfer as perceived by three groups of extension personnel in Karnataka state of South India. The study also examined whether type of agriculture influences perceptions. A total of 244 extension personnel responded to a mail survey developed by the researchers. Overall, extension personnel perceived lack of funds to conduct timely research, inadequate transportation, resources of farmers, cost of inputs, and availability of credit as major constraints in technology transfer. Extension personnel working in dryland agriculture perceived several technology transfer statements as constraints more so than extension personnel working in irrigated agriculture.