This is part 5 of a series of contributions by the critical properties group of the IUPAC Commission 1.2 on Thermodynamics, Subcommittee on Thermodynamic Data. It presents all the known experimental data for the critical temperature, pressure, and volume of branched alkanes and cycloalkanes. Critical temperatures have been converted to the ITS-90 scale. Recommendations together with uncertainties are given for 54 compounds.