This paper presents an approach for metadata reconciliation, curation and\nlinking for Open Governamental Data Portals (ODPs). ODPs have been lately the\nstandard solution for governments willing to put their public data available\nfor the society. Portal managers use several types of metadata to organize the\ndatasets, one of the most important ones being the tags. However, the tagging\nprocess is subject to many problems, such as synonyms, ambiguity or\nincoherence, among others. As our empiric analysis of ODPs shows, these issues\nare currently prevalent in most ODPs and effectively hinders the reuse of Open\nData. In order to address these problems, we develop and implement an approach\nfor tag reconciliation in Open Data Portals, encompassing local actions related\nto individual portals, and global actions for adding a semantic metadata layer\nabove individual portals. The local part aims to enhance the quality of tags in\na single portal, and the global part is meant to interlink ODPs by establishing\nrelations between tags.\n