The interaction between polyvinylpyrrolidone (PVP) and a mixture of anionic and nonionic surfactants have been investigated by surface tension measurements. The surfactant mixtures are decyl-b-maltoside (C10M) together with dodecyl benzenesulfonate (C12BS) and octaethyleneglycol mono n-decyl ether (C10EO8) together with C12BS. Surface tension measurements of the surfactant mixtures in presence of PVP show that C10EO8 competes more effectively than C10M with PVP in the interaction with C12BS.