The study employs a stochastic frontier production function analysis to examine the productivity and technical efficiency of Soya beans production in Oyo State, Nigeria and also to identify the factors affecting the technical insufficiency using farm level survey data. The result shows that Soya beans farmers operated on a very small scale and are profitable, the productivity analysis shows that agro chemicals fertilizer, farm size and labour were all positive and significantly related to the technical efficiency. The return to scale (TRS) of 0.9904 shows that soyabean production was in rational state of the production surface. The technical efficiency varies from 0.1094 to 0.9568 with a mean technical efficiency of 0.6649, indicating that farmers were operating below the efficiency frontier. Thus, in the short run, there is a scope to increase output by 34%. The inefficiency model revealed that education of the farmers; extension visits and access to credit are the main factors that affect technical efficiency of the farmers
