In this study, the effect of ohmic heating on rheological behaviour of milk and milk powder reconstitutes was investigated. Samples were heated from 20°C to 80 °C at 30 V/cm voltage gradient by ohmic heating. Samples were also heated at water bath for the purpose of control heating. The change of rhelogical properties during both heating methods were determined by using concentric-cylinder type viscometer. The heating method and the type of the sample were statistically significant on the change of viscosity. It was found that the viscosity was more sensible to temperature change for milk powder solution samples during ohmic heating or for milk during control heating. The data obtained must be taken into account in the design of pilot and industrial scale continuous ohmic heating systems, especially in the estimation of pumping requirement and the change of velocity profiles within ohmic heating unit. The steady velocity profiles within the system are essential for homogeneous heating.