U.S. relations with many countries are governed by a number of treaties, both multilateral and bilateral. The functions of U.S. consular officers to protect U.S. citizens abroad are listed in a multilateral treaty called the Vienna Convention on Consular Relations of 1963 which defines the framework for consular relations between countries.  The U.S. also has bilateral treaties with a number of countries concerning consular matters. You can read about these here: Bilateral Consular Conventions.

Private international law is the body of conventions, model laws, national laws, legal guides, and other documents and instruments that regulate private relationships across national borders.  These multi-lateral treaties include:

• Hague Apostille Convention
• Hague Evidence Convention
• Hague Service Convention
• Hague Child Abduction Convention
• Hague Adoption Convention

Criminal Matters

• International Prisoner Transfer Program

Other Useful Links

• Hague Conference on Private International Law
• Council of Europe Treaty Office
• Organization of American States (OAS) Treaties Page
• Digest of International Law
• United Nations Treaties Page

Diplomatic and Consular Specific Treaty Links

• Vienna Convention on Consular Relations
• Vienna Convention on Diplomatic Relations
• Bilateral Consular Conventions

U.S. Department of State

• Treaties in Force
• Treaty Actions