All 27 EU member states have designated National CBAM Competent Authorities responsible for administering Carbon Border Adjustment Mechanism compliance. The December 2024 updated directory provides comprehensive contact information including email addresses, telephone numbers, physical addresses, & website links. Institutional arrangements vary substantially, encompassing customs administrations, environmental agencies, climate authorities, & specialized units reflecting diverse governance traditions. Several countries employ multi-agency models distributing responsibilities across multiple authorities based on functional specialization. The directory enables importers to identify appropriate authorities based on establishment location & initiate regulatory engagement for authorization applications, reporting submissions, & compliance inquiries.