The ROSSIO vocabularies are a set of concept schemes in the social sciences, arts and humanities for facilitating knowledge organization in the platform. There are presently core vocabularies for Agents, Places, Periods and Topics. The ROSSIO Infrastructure enables the construction and management of vocabularies in SKOS through VocBench 3 for authorized users. The vocabularies are hosted through Skosmos. This tool allows users to browse the vocabularies and allows them to be published on the Web as linked data.