The article constitutes a comparative legal study of mediation based on for procedural regulations, i.e. Act of 6 June 1997: Code of Criminal Procedure, Act of 17 November 1964: Code of Civil Procedure, Act of 14 June 1960: Code of Administrative Procedure, and Act of 30 August 2002: Law on the Proceedings before Administrative Courts carried out with the use of a dogmatic method. The author analyses the solutions that, in his opinion, make it possible to propose a thesis on far-reaching convergence of the basic, and at the same time of normative provenance, principles of mediation. The principles include amicability, voluntariness (optionality), commonness, loyalty to parties, confidentiality and non-openness of mediation, as well as a mediator’s impartiality. The above-mentioned convergence does not mean complete homogeneity of particular solutions or their non-defectiveness, which is exemplified by Article 2591 CPC and Article 83 § 4 CAP. It is also shown that the domestic solutions are in conformity with the solutions recommended by the Committee of Ministers of the Council of Europe.