The Editio Critica Maior (shortened to ECM) is a critical edition of the Greek New Testament being produced by the Institut für neutestamentliche Textforschung (Eng. "Institute for New Testament Textual Research") in collaboration with other international institutes.
The Editio Critica Maior project is supported by the Union of German Academies of Sciences and Humanities. It is to be completed by the year 2030.