Binary systems containing CO2 and common hydrocarbons have been extensively measured and a large amount of data are available for such mixtures. However, a lack of data is still observed for systems containing less common compounds such as heterocyclic hydrocarbons like indane (C9H10, CAS 496-11-7). Naphthenoaromatic compounds (tetralin, indane and their alkylated components) can nonetheless be found in substantial proportion in some crude oils. In this study, the phase behaviour of the CO2 (1) + indane (2) binary system has been experimentally studied at temperatures ranging from 293.15 K to 360.15 K. To our knowledge, no literature data are available relating to this mixture. Measurements were performed using two experimental devices: a classical variable volume high– pressure cell allowing visual observation of phase transitions at constant overall composition and a small volume high pressure microscopy (HPM) cell. The results obtained in this work reveal the occurrence of vapor–liquid, liquid–liquid and vapor–liquid–liquid phase transitions in the investigated temperature range. Bubble points and coordinates of the three-phase line were measured whereas the Peng-Robinson equation of state was used to calculate the phase diagram of the mixture. In some parts of the phase diagram, it was not possible to measure saturation pressures with reasonable accuracy. Indeed, in the liquid-liquid phase splitting region as well as for rich-CO2 compositions, inspection of the fluid using the HPM cell revealed that the phase transition was not an abrupt phenomenon but rather a continuous process with, at the beginning, the appearance of hardly detectable thin droplets. Preliminary results obtained in this study allow us to assume that the CO2 + indane system belongs to type III binary system.