Thirteen flavonoids were isolated from the fresh sweet fruit of Averrhoa carambola L. (Oxalidaceae), commonly known as star fruit, and their structures were determined by spectroscopic and chemical methods. 8-Carboxymethyl-(+)-epicatechin methyl ester, pinobanksin 3- O -β- d -glucoside, and carambolasides M–Q were undescribed structures. (+)-Epicatechin, aromadendrin 3- O -β- d -glucoside, helicioside A, taxifolin 3′- O -β- d -glucoside, galangin 3- O -rutinoside, and isorhamnetin 3- O -rutinoside were reported from this species for the first time. Pinobanksin 3- O -β- d -glucoside and carambolasides M–Q showed more potent 2,2′-azinobis-(3-ethylbenzthiazoline-6-sulphonic acid) (ABTS) radical cation scavenging activity (IC 50 = 5.3–2.3 μM) than l -ascorbic acid (10.5 μM). Further, (+)-epicatechin, pinobanksin 3- O -β- d -glucoside, isorhamnetin 3- O -rutinoside, and carambolasides O–Q exhibited weak porcine pancreatic lipase inhibitory activity. [ABSTRACT FROM AUTHOR]