The chapter is dedicated to the problem of receiving the canon law of the Eastern Catholic Churches as an instrument in ecumenical dialogue. This ecumenical role of the Eastern Catholic law is often identified in Catholic documents and studies. However, Orthodox authors tend to emphasize the ecclesiological differences in processing canonical material in the Catholic West and in the Orthodox East. This chapter will consider several attempts which were made in the twentieth century to create a bridge between Catholic and Orthodox juridical traditions in legislative texts of the Catholic Church.