| C&F | Cost and Freight (Incoterm) |
| C&I | Cost and Insurance |
| CACM | Central American Common Market |
| CAD | Cash against documents |
| CADIC | Comparative Analysis of Domestic Industry’s Condition |
| CAFC | Court of Appeals for the Federal Circuit |
| CAFTA | Central American Free Trade Agreement |
| CAIP | Community Adjustment Investment Program |
| CAP | Common Agricultural Policy (EU) |
| CAP | Country Action Plan |
| Capra-TFOC | Capra-Trade Facilitation Office Canada |
| CARIBCAN | Canadian-Caribbean Basin Initiative |
| CARICOM | Caribbean Common Market |
| CAS | Country Assistance Strategy (World Bank) |
| CBERA | Caribbean Basin Economic Recovery Act |
| CBI | Caribbean Basin Initiative |
| CCC | Commodity Credit Corporation |
| CCC | Customs Cooperation Council |
| CCCN | Customs Cooperation Council Nomenclature |
| CCL | Commerce Control List (formerly Commodity Control List) |
| CCNAA | Coordination Council for North American Affairs (Taiwan) |
| CCPIT | China Council for the Promotion of International Trade |
| CEA | Chinese Economic Area |
| CEA | Council of Economic Advisers |
| CEMCA | Economic and Monetary Community of Central Africa |
| CEP | Constructed Export Price |
| CEPGL | Economic Community of the Great Lakes Countries |
| CEPT | Common effective preferential tariff |
| CER | Australia-New Zealand Closer Economic Relations |
| CET | Common External Tariff |
| CFIUS | Committee on Foreign Investment in the United States |
| CFR | Cost and Freight (Incoterm) |
| CFTA | United States-Canada Free Trade Agreement |
| CG | Consultative Group |
| CG-18 | Consultative Group of Eighteen (GATT) |
| CGIAR | Consultative Group on International Agricultural Research |
| CIA | Cash in advance |
| CIF | Cost, Insurance, and Freight (Incoterm) |
| CIF & C | Cost, Insurance, and Freight and Commission |
| CIL (CiL) | Clean Import Loan |
| CIME | Committee on International Investment and Multinational Enterprises (OECD) |
| CIMS | Commercial Information Management System, U.S. Department of Commerce |
| CIP | Carriage and Insurance Paid (Incoterm) |
| CIS | Commonwealth of Independent States |
| CIT | United States Court of International Trade |
| CITES | Convention on International Trade in Endangered Species |
| CITA | Committee for the Implementation of Textile Agreements |
| CITIC | China International Trust and Investment Corporation |
| CITT | Canadian International Trade Tribunal |
| CIV | Customs Import Value |
| CMP | Country Marketing Plan |
| CN | Combined Nomenclature |
| CNUSA | Commercial News USA, U.S. Department of Commerce |
| COCOM | Coordinating Committee for Multilateral Export Controls (NATO) |
| CODE | Committee on Development Effectiveness |
| CODEX | Codex Alimentarius Commission |
| COE | Council of Europe |
| COMECON | Council for Mutual Economic Assistance |
| COMESA | Common Market for Eastern and Southern Africa (formerly a PTA) |
| COI (CoI) | Certificate of Inspection |
| COM (CoM) | Certificate of Manufacture |
| COP | Cost of Production |
| CP | Contracting Party |
| CPE | Centrally Planned Economy |
| CPT | Carriage Paid to (Incoterm) |
| CSCE | Conference on Security and Cooperation in Europe |
| CT | Countertrade |
| CTA | Committee on Trade in Agriculture (GATT) |
| CTF | Certified Trade Fair, U.S. Department of Commerce |
| CV | Constructed Value |
| CVD | Countervailing Duty |
| CWO | Cash with order |
| CXT | Common External Tariff |
