A total of 16 targeted oleanolic acid–uracil/thymine hybrids were designed and synthesized as potential cytotoxic agents. Most IC50 values were under 10.0 μM, with some of them under 0.1 μM in vitro test against tested cells (Hep-G2, A549, BGC-823, MCF-7 and PC-3). These hybrids displayed much more potent inhibitory activities compared with oleanolic acid and commercial anticancer drug 5-fluorouracil