This briefing is a report to the UN Human Rights Council on the serious language discrimination suffered by citizens in the Catalan-speaking regions of Spain. The account shows that rather than isolated incidents, cases of severe language discrimination are a systematic situation occurring as a consequence of structural discrimination enshrined in the Spanish legal structure. The discriminatory language configuration established by the Spanish Constitution and the legal acts developing it are the origin of this situation. This factor, combined with widespread support for supremacist Castilian-based Spanish nationalism among State civil servants, creates a framework of impunity for public workers who commit serious discrimination. In fact, none of the reported cases of serious language discrimination have ever been prosecuted.