The Observatori Metropolità de l'Habitatge de Barcelona (O-HB) is a supra-municipal instrument dedicated to the research and analysis of data related to housing. Its purpose is to support the design and evaluation of public housing policies in the metropolitan area. It was created in 2017 as an initiative of the Ajuntament de Barcelona, the Àrea Metropolitana de Barcelona (AMB), the Diputació de Barcelona and the Generalitat de Catalunya, with the support of the Associació de Gestors d'Habitatge Social (GHS). Since 2018, it has been part of the structure of the Institut d’Estudis Regionals Metropolitans de Barcelona (IERMB).