Države članice, institucije, organi, uradi in agencije Unije in vse druge fizične ali pravne osebe lahko v primerih in pod pogoji, določenimi v poslovniku, vložijo ugovor tretjega, s katerim lahko izpodbijajo sodbo, ki je bila izdana v zadevi, pri kateri same niso bile udeležene, sodba pa vpliva na njihove pravice.
Member States, institutions, bodies, offices and agencies of the Union and any other natural or legal persons may, in cases and under conditions laid down in the Rules of Procedure, institute third-party proceedings to contest a judgment rendered without their being heard, where the judgment is prejudicial to their rights.