In this study, the thermophysical properties of the nanofluid prepared by adding as basic fluid 1.3% zeolite nanoparticles into water were determined. Many researchers are working to improve the performance of heat transfer fluids. One of the methods used for increasing the overall thermal conductivity of the fluid is the addition of high thermal conductivity materials such as metal oxides, metals, and carbon as nanosized particles to heat transfer fluids. In this study, the specific heat capacity, thermal conductivity, and viscosity of the nanofluid obtained with zeolite nanoparticles in order to increase the fluid’s thermal performance were investigated experimentally. Studies of nanofluids with zeolite nanoparticles are lacking in the literature.