This is part 9 of a series of contributions by the critical properties group of the previous IUPAC Commission I.2 on Thermodynamics, Subcommittee on Thermodynamic Data and the present IUPAC Project, Critical Compilation of Vapour Liquid Critical Properties, sponsored by the Physical and Biophysical Division. It presents all known experimental data for the critical constants of organic hydrocarbon compounds containing nitrogen. Recommendations are given together with uncertainties.