Considering that, throughout history, no theme has been so impressive and interpreted in such a variety as that of the Inquisition, in this study I will explain some issues regarding the ways of communication of people involved in this phenomenon, both clergy as laity. As sources of research on ways of communication we have the collections of laws and decrees, papal bulls, church canons, council acts, monastic annals, histories of local communities and abbeys, minutes of trials, sentences of inquisitorial trials, biographies of bishops, popes, various panegyric etc. To these are added various codes of criminal procedure or manuals for the use of inquisitors, guides according to which were recognized persons who practiced witchcraft, the legislation applicable to convicting heretics and persons who taught other teachings than that preached by the Western Church. All these documents provide many details about the way inquisitorial processes were organized and conducted. The stages of a process carried out by the Inquisition: the visit of the Inquisitor, the sermon and the grace period, the investigation with the denunciation of the suspects, the interrogation of the accused, the summoning and hearing of witnesses, the intervention of the lawyer, the coercion, the sentence, the execution of the sentence, all these present the way in which the whole judicial act was organized, as well as the way in which the members of the inquisitorial apparatus communicated with the persons suspected of heresy and with the various communities in which they were active.