An ambassador-at-large is a diplomat of the highest rank or a minister who is accredited to represent his or her country and their people internationally.
Unlike an ambassador-in-residence who is usually limited to a country or embassy, the ambassador-at-large is entrusted to operate in several usually neighboring countries, a region or sometimes hold a seat in an international organization like the United Nations and the European Union. In some cases an ambassador-at-large may even be specifically assigned a role to advise and assist the state or a government in particular issues. Historically, presidents or prime ministers have designated special diplomatic envoys for specific assignments, primarily overseas but sometimes also within the country as an ambassador-at-large.
According to international protocol, ambassadors and ambassadors-at-large are officially styled and addressed as His/Her Excellency, or Mister/Madam Ambassador. The title may be abbreviated in official correspondence as H.E.
United States ambassadors-at-large
The US President appointed the first official specifically to bear the title of ambassador-at-large on 12 March 1949, under the authority vested in Article II, Section 2 of the U.S Constitution to deal with specific foreign policy issues which have been frequently, but not always, spelled out in their commissions.
Ambassador-at-Large positions in the diplomatic corps of the US State Department include:
- Coordinator for Counterterrorism
- Ambassador-at-Large for Global Women's Issues
- United States Global AIDS Coordinator
- Ambassador-at-Large for International Religious Freedom
- Ambassador-at-Large for War Crimes Issues
- Ambassador-at-Large to Monitor and Combat Trafficking in Persons
- Charles Aznavour, Franco-Armenian singer, French Ambassador-at-Large to Armenia
- Princess Masna Bolkiah, Brunei's Ambassador-at-Large and Minister of Foreign Affairs and Trade
- Nicolas Kazadi, Ambassador-at-Large for the Democratic Republic of the Congo
- Chan Heng Chee, Ambassador-at-Large representing Singapore and former ambassador to the United States from 1996 to 2012
- Suzan Johnson Cook, former United States Ambassador-at-Large for International Religious Freedom
- Henry A. Crumpton, Coordinator for Counterterrorism at the Department of State
- Ahmet Davutoğlu, Formerly Ambassador-at-Large of Turkey; he subsequently served as Foreign Minister and Prime Minister.
- Eric Goosby, United States Global AIDS Coordinator (Ambassador-at-Large for HIV and AIDS)
- León María Guerrero III, Undersecretary for Foreign Affairs under Ramon Magsaysay (1953–1954) and Ambassador-at-Large under four Philippine Presidents: Ramon Magsaysay (1954–1957), Carlos P. Garcia (1957–1961), Diosdado Macapagal (1961–1965) and Ferdinand E. Marcos (1965–1980).
- Georg von Habsburg, Ambassador-at-Large of Hungary
- John Hanford, former United States Ambassador-at-Large for International Religious Freedom
- Philip Jessup, United States Ambassador-at-large under President Harry S. Truman.
- Tommy Koh, Ambassador-at-Large of Singapore
- Stavros Lambrinidis, Ambassador-at-Large of Hellenic Republic, Vice President of the European Parliament and Minister for Foreign Affairs of Greece
- Gene Loh, Ambassador-at-Large of the Republic of China (Taiwan) from 1997 to 2001
- Javed Malik, Pakistan's Ambassador-at-Large to the Gulf Region.
- Amina Mohammed, Ambasador-at-large representing Kenya
- Lineo Ntoane, Kingdom of Lesotho Ambassador-at-Large.
- Dame Nuala O'Loan, of Ireland. Roving Ambassador for Conflict Resolution and Special Envoy to Timor-Leste
- Ong Keng Yong, Ambassador-at-Large at the Ministry of Affairs, Singapore and former Secretary-General of Association of Southeast Asian Nations (ASEAN)
- Gopinath Pillai, Ambassador-at-Large of Singapore
- Oscar de la Renta, Ambassador-at-Large of the Dominican Republic.
- Carlos P. Romulo, President of the United Nations General Assembly (1949–1950), Secretary/Minister of Foreign Affairs and Ambassador-at-Large under three Philippine Presidents: Elpidio Quirino (1950–1952), Diosdado Macapagal (1963–1964) and Ferdinand Marcos (1968–1984).
- Petri Salo, Finland's Roving Ambassador for the South Caucasus (Armenia, Azerbaijan and Georgia)
- Strobe Talbott, US Ambassador-at-Large and Special Advisor to the Secretary on the New Independent States
- Stephan Welk, Ambassador-at-Large Republique Centrafricaine 
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