This is part 4 of a series of contributions by the critical properties group of the TCTPAC Commission 1.2 on Thermodynamics, Subcommittee on Thermodynamic Data. It presents all known experimental data for the critical constants of alphatic alkanols up to C-12. Recommended critical constants are given together with their uncertainties, which increase for the more unstable higher alkanols. The critical temperatures have been converted to ITS-90.