2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/7291The applicability and apparent uncertainties of the techniques currently available for measuring or estimating black-hole masses in AGNs are briefly summarized.6 pages. Invited review at `AGN Physics with the Sloan Digital Sky Survey' conference (July 2003), eds. G. Richards and P. Hall (ASP Conf. Series, 2004)Astrophysicstext