The Barcelona Metropolitan Housing Observatory (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 Barcelona City Council, the Barcelona Metropolitan Area (AMB), the Barcelona Provincial Council and the Generalitat de Catalunya, with the support of the Association of Social Housing Managers (GHS). Since 2018, it has been part of the structure of the Institut d’Estudis Regionals Metropolitans de Barcelona (IERMB).