A group contribution method to predict the thermal conductivity of ionic liquids as a function of the temperature and pressure, is present. Thermal conductivity measures the ability of a material to conduct heat. Experimental thermal conductivity data of 41 ionic liquids (400 experimental data points) were used to obtain the proposed group contribution method for ranges of 273-390 K for the temperature, 100-20,000 kPa for the pressure, and 0.1-0.22 Wm(-1) K-1 for the thermal conductivity. The correlative and extrapolative capability of the proposed model was examined using a testing data set not used during the correlation step. Thus, the total data set was divided in a correlation set with 300 experimental data points, and a validation set with 100 experimental data points. Results show that the proposed group contribution method to predict the thermal conductivity of ionic liquids as a function of the temperature and pressure present a good accuracy with lower deviations such as AARD less than 1.90% and R-2 of 0.9879 for the correlation set, and AARD less than 2.33% with R-2 of 0.9754 for the prediction set. 2015 Elsevier B.V. All rights reserved.