The gas-liquid critical temperatures of 23 alkenes (C-5-C-8), 8 amine compounds (C-3-C-8), and 8 cyclic hydrocarbons (C-8-C-10) are reported. These values, together with the previously reported critical temperatures for alkenes, amines, and cyclic hydrocarbons, provide extended data sets which can be used to develop more accurate correlations for predicting the critical temperatures of these alkene, amine, and cyclic hydrocarbon compounds. The majority of compounds whose critical temperatures are reported here have not been previously investigated.