Comparative Procedural Law and Justice (CPLJ) is a global project on comparative civil justice, organized by the former Max Planck Institute Luxembourg for Procedural Law and supported by the Luxembourg Research Fund FNR (FNR - O19/13946847).

Officially launched in September 2020, it was the flagship research project of the Department of European and Comparative Procedural Law of the Max Planck Institute Luxembourg. In January 2024, the Max Planck Institute Luxembourg and CPLJ were transferred to the University of Luxembourg.

Burkhard Hess was the founding director of the Max Planck Institute for Procedural Law where CPLJ was originally launched. Since September 2024, he has been continuing the project as leading editor from his new chair and with the assistance of his team at the University of Vienna.