A chemical examination of the tannins in the leaves of Macaranga tanarius (L.) MUELL. et ARG. (Euphorbiaceae) has led to the isolation of seven new hydrolyzable tannins (22-28), together with twenty-one known tannins (1-21). On the basis of chemical and spectroscopic evidence, the structures of compounds 22-28 were established as 1,4-di-Ogalloyl-x-D-glucopyranose (22), 3,4-di-O-galloyl-D-glucopyranose (23), galloylpunicafolin (24), galloylgeraniin (25), 1-O-galloyl-3-O-brevifolincarboxyl-β-D-glucopyranose (26), 1,2,4-tri-O-galloyl-3,6-(S)-hexahydroxydiphenoyl-β-Dglucopyranose (macaranganin) (27) and 1,2,4-tri-O-galloyl-3,6-(R)-dehydrohexahydroxydiphenoyl-β-D-glucopyranose (tanarin) (28).