A new carbohydrate ester of cinnamic acid named gleditschiaside A was isolated from the methanolic extract of the leaves of Gleditschia australis Hemsl., (Caesalpiniaceae). Its structure was elucidated by means of ESI-mass spectrometry, 1 H-NMR, 13 C-NMR (CPD and DEPT), HSQC and HMBC spectra in comparison with the literature.