Abstract: Studying the sources of town law of Western Europe of the XI-XV centuries, the authors come to the conclusion that the town law of Western Europe during the era of High Middle Ages had a fairly progressive content during this historical period. This was explained by the specific goal of criminal legislation, driven by demand of town community – protection of the allocated to the town dwellers personal, political, and economic rights and liberties. The criminal legal town norms highlighted various categories of crimes, distinguished types of accomplices of a crime, forms of guilt, defined conditions for implementation of the institution of necessary defense, demanded adherence to the principle of guilt during trial, and consideration of mitigating circumstances. The medieval town law of Western Europe of the XI-XV centuries has abolished a number of feudal in their nature procedural institutions, and devised positions on judicial guarantees of rights of the defendant. It also codified the requirements for objectiveness of evidence, juridical ability to use the services of a representative equal to the other side of the legal dispute, right to acquittal in case of an alibi that would exclude the possibility of commission of the crime with which the defendant is being charged, due to their presence at another location.