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The purpose of this investigation was to isolate novel flavonoids from Alpinia galanga rhizomes. The methanol extract of Alpinia galanga was subjected to column chromatography and eluted with ethyl acetate-methanol (9: 1) to yield a compound, galangoflavonoside (AG 11). The structure of the compound was elucidated by various spectral techniques (UV, IR, 1H NMR, 13C NMR, and MS). Chemical investigation of the extract furnished a new flavonoid galangoflavonoside (AG 11). The isolated compound, galangoflavonoside (AG 11,) could be a potential therapeutic compound as well as serve as a lead compound in the synthesis of other useful flavonoids. Isolation of the galangoflavonoside from Alpinia galanga rhizomes is being reported, to the best of our knowledge,