Three combination bands involving intermolecular modes of the most stable isomer of the OC-N2O van der Waals complex have been observed, two in the carbon monoxide CO stretch region (similar to 2150 cm(-1)) and one in the nu(3) asymmetric stretch region of N2O (similar to 2223 cm(-1)). Vibrational assignment is achieved by comparison with data recently published (Barclay , A. ; et al. Chem. Phys. Lett. 2016 , 62 , 651 ), concerning OC-CO2. Two of these bands involve the same intermolecular mode, one with the CO stretch and the other with the nu(3) asymmetric stretch of N2O. The values of intermolecular frequency deduced from these two bands agree very well, showing no significant dependence on intramolecular vibrational excitation.