A total of nine oilseeds with more than 15 wt% oil have been investigated for evaluating them as feedstock for biodiesel industries. Fatty acid profiles of all the nine oil samples have been determined by GC-MS analysis. The saponification numbers, gross heats of combustion of the oils and those of corresponding fatty acid methyl esters (FAMEs) as well as cetane indices of the FAMEs have been calculated empirically. Iodine values have been determined experimentally. These values have been used for predicting the quality of the corresponding biodiesels. If prepared from these oils, biodiesels are likely to meet the major specification of biodiesel standards of the USA, Germany and European Standard Organisation. Seed oil from Cucumis sativus is found rich in linoleic acid which is considered an essential fatty acid of biological significance.