Four ellagic acid rhamnosides were isolated from the stem bark of Eucalyptus globulus. Their structures have been established on the basis of the analysis of their 1 H NMR, 1 3 C NMR, HMBC, IR and MS spectral data. The HMBC data of these compounds were most useful for their structure determinations, with these bring determined to be 3-O-methylellagic acid 3'-O-α-rhamnopyranoside, 3-O-methylellagic acid 3'-O-α-3''-O-acetylrhamnopyranoside, 3-O-methylellagic acid 3'-O-α-2''-O-acetylrhamnopyranoside, 3-O-methylellagic acid 3'-O-a-4''-O-acetylrhamnopyranoside, respectively. Their antioxidant activities were evaluated by measuring the inhibition of lipid peroxidation using rat liver microsomes, with IC 5 0 values of 10.0-14.0 μg/ml.