In combination with metal catalysts, hydrogen peroxide has been used as a selective oxidant for liquid phase oxidation of organic compounds. 1 In order to avoid the hazards connected with the use of concentrated solution of H2O2 and also in the permanent quest for cheap, clean, selective and efficient reagents for the epoxidation of alkenes, two complexes of H2O2 with urea (UHP) and DABCO-di-N-oxide have been reported. 2 The mild oxidizing action of hydrogen peroxide is considerably enhanced in the presence of certain metal oxides, metal Schiff base and metal-porphyrin catalysts. The best known of these reagents is Fenton’s reagent, which consists of ferrous and H2O2. But the yields of the oxidized substrate are often low, which severely limits the synthetic utility of Fenton’s reagent. 3 Very recently, the efficacy of polyvinylpyrrolidone-supported H2O2 (PVP-H2O2) in the epoxidation of α,β-enones has been reported. PVP-H2O2 is very stable at room temperature and easy to handle. However, the reagent has been shown to have relatively low activity towards electron rich and simple alkenes. 4,5 In the present work, very mild conditions for the efficient epoxidation of a wide range of acyclic and cyclic alkenes including electron-rich, electron deficient and simple ones with PVP-H2O2 in the presence of manganese(III) mesotetraphenylporphyrin, Mn(tpp)X (X = SCN, OCN, Cl, OAc) (Fig. 1) is reported.