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Group action is a new institution to Polish civil procedure that has been introduced by The Act on Asserting Claims in Class Proceedings of 17 December 2009, the “Polish Class Action Act”. The act came into force on 19 July 2010 and is a step towards unifying Polish law with European Union law. This act is the main regulation, but is not all-encompassing. Issues not addressed in this act are regulated by the Code of Civil Procedure of 1964 according to Article 24 of the Act (the Act on Asserting Claims in Class Proceedings of 17 December 2009). Under this regulation there are certain certification criteria that must be met to bring a class action into court. In this paper I will briefly present crucial aspects of the Polish regulation, such as the certification criteria, the scope of application, requirements for monetary claims, class representatives, stages of proceedings, remedies, and the costs of class actions.