This article presents a PMU placement methodology for voltage stability monitoring in Electrical Power Systems (EPSs).This methodology identifies the nodes and areas that are most sensitive to voltage stability problems, to locate the PMUs and to guarantee the voltage stability monitoring.Unlike other studies, this methodology considers the EPS as a whole and under N-1 contingencies.Criteria such as voltage stability margins, V-Q sensitivity analysis, modal analysis with participation factors in nodes, lines and generators under normal operating conditions and critical contingencies were used to identify the nodes to be installed with the PMUs.The methodology was applied to the New England 39-node test system, and the results show that this methodology is appropriate for the identification of areas and nodes that are sensitive to voltage stability problems and that these are the EPS points that should be considered for the installation of the PMUs.