We report Boyle temperatures of 83 pure substances calculated using the Zeno (unit compressibility) line from standard or reference equations of state (EOS). We compare the results using different EOS and from correlations already published in the literature. The maximum absolute difference in the calculation of the Boyle temperature from different EOS is 15, 3, 24 and 63 K for hydrocarbons, gases, freons, and other substances, respectively. For alcohols, the difference in calculated Boyle temperatures is 300 K for methanol and 5 K for ethanol. (c) 2007 Elsevier B.V. All rights reserved.