Abstract: The study measured the level of technical efficiency in Nigerian yam farming using yam producers survey data. The primary data for the study were collected randomly from 240 yam farmers selected with multistage sampling technique across 12 communities in Osun state, Nigeria. Data collected were analyzed using descriptive statistics, Chi-square statistics and Stochastic Frontier Production Function model (SFPF). The empirical results revealed that the cost of yam sett used, labour used and farm size were significantly different from zero and of importance in production of yam. Also, the year of formal education, farming experience and access to credit were the main socio-economics characteristics affecting the technical inefficiency of yam farmers. In addition, the technical efficiencies of the yam farms ranged between 0.343 and 0.962 with a mean of 0.698. This shows that on the average, farmers were able to obtain about 70% of potential output from a given mix of inputs. The return to scale of 1.119 obtained shows that yam farms were operating in stage 1 of the production surface (increasing returns to scale). The study therefore, recommends that research institutes should make available an improved variety of yam sett. Also year of formal education, farming experience and access to credit should be manipulated by policy makers in order to improve the yam farmers technical performance.