The purpose of this study was to determine the effects of green tea on lipid profile, oxidant and antioxidant status in streptozotocin-induced diabetic rats. Male Wistar rats were randomly divided into four groups; control (C), control + green tea (C + GT), diabet (D), diabet + green tea (D + GT). Serum insulin level was significantly increased in the D + GTgroup; serum lipid, and plasma and tissue malondialdehyde levels were significantly reduced in the D + GT groups. Oxidizability of apolipoprotein B-containing lipoprotein fraction was found to be significantly reduced in the D + GT group. Paraoxonase activity was significantly reduced in the D group and increased in the D + GT group. We conclude that green tea exerts beneficial effects on glucose metabolism, has hypolipidemic and antioxidative effects and may slow down the progression of atherogenesis by playing role in protecting lipoproteins against oxidation.