Baltasar Garzón Real is a Spanish former judge. He served on Spain's central criminal court, the Audiencia Nacional, and was the examining magistrate of the Juzgado Central de Instrucción No. 5, which investigates the most important criminal cases in Spain, including terrorism, organised crime, and money laundering. In 2011, he was suspended from judicial activity and in 2012 he was convicted of illegal wiretapping and disbarred for a period of 11 years. During this time, Garzón legally assisted Julian Assange.

An examining magistrate is a judge in an inquisitorial system of law who carries out pre-trial investigations into allegations of crime and in some cases makes a recommendation for prosecution. Also known as an investigating magistrate, inquisitorial magistrate, or investigating judge, the exact role and standing of examining magistrates varies by jurisdiction. Common duties and powers of the examining magistrate include overseeing ongoing criminal investigations, issuing search warrants, authorizing wiretaps, making decisions on pretrial detention, interrogating the accused person, questioning witnesses, examining evidence, as well as compiling a dossier of evidence in preparation for trial.