ENThe normative regulation of pre-trial proceedings in criminal proceedings, poorly studied in the Belarusian criminal procedure doctrine, in accordance with the provisions of the Statutes of the Grand Duchy of Lithuania of 1529, 1566, 1588, is considered in the article. The adoption of these normative documents is associated with the flowering of legal theory and practice of legislative activity of the feudal period in the Belarusian and Ukrainian lands. A significant part of the norms of the Statutes regulated the legal status and activities of the bodies and officials involved in criminal prosecution and justice. The author analyzes the legal status of persons engaged in pre-trial proceedings in the XVI–XVIII centuries (vizh, vozny, etc.), the normative regulation of the relevant procedural actions, as well as law enforcement on the lands of the Grand Duchy of Lithuania, which are now part of Belarus. Among other things, such a institute as a scrutinium, as well as the activities of the Кopnoy court in detecting and recording traces of a crime, are subjected to analysis. It is noted that in the Statutes of the Grand Duchy of Lithuania (especially the Statute of 1588) the procedure for conducting such investigative actions as inspection, examination and search in their current understanding was already regulated in detail. Attention to the rapid development of regulations in the 16th century governing the production of these investigative actions is also drawn in the article. The author notes that a number of norms of the Statutes of the Grand Duchy of Lithuania of 1529, 1566, 1588, relaying into subsequent normative acts and getting their development in them, have found today in the modern Code of Criminal Procedure of the Republic of Belarus.