The paper presents results of measurements of basic thermophysical properties of ethylene glycol based yttrium aluminum garnet (Y(3)AL(5)O(12)-EG) nanofluids. Nanofluids used in presented experiments were prepared with two-step method based on commercial nanoparticles. Basic theological properties were investigated on HAAKE MARS 2 rheometer (Thermo Electron Corporation, Karlsruhe, Germany). Dynamic viscosity curves in the range of shear rates from 10 to 1000 s(-1) at a constant temperature of 298.15 K were determined. Additionally, the temperature dependence of the viscosity in the range from 273.15 K to 333.15 K was measured. To determinate thermal conductivity of nanofluids a KD2 Pro Thermal Properties Analyzer (Decagon Devices Inc., Pullman, Washington, USA) was used. The dependence of thermal conductivity of Y(3)AL(5)O(12)-EG nanofluids on the concentration of nanoparticles was measured at constant temperature of 298.15 K. (C) 2015 Elsevier Ltd. All rights reserved.