Abstract: This study delve through the resource-use efficiency in yam production among randomly selected sample of 150 yam producers in 5(out of 18) purposively selected Local Government Areas (L.G.As) in Ondo State, Nigeria. The production function analysis revealed inefficiency in the use of land, hired labour, family labour and investment on seed yam. The Marginal Value of Products (M.V.Ps) for inputs used in production were N97, 804 per hectare, N3, 349 for hired labour, N122: 50 for family labour and N156:10 for seed yam (for additional unit of input).Also the M.V.P of the inputs were higher than the corresponding Marginal Factor Costs (M.F.Cs), signifying input under-utilization. In this connection, an increase in allocation of land, hired labour, family labour and investment on seed yam will surely raise the output of yam. Also there is need for improved dissemination of information on Miniset-technique of raising seed yam.