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
- 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
- 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
- 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 
- The Guide of the Modern Diplomatic Protocol
- "Goosby, Eric". State. 23 June 2009. Retrieved 8 January 2013.
- "The Habsburgs' new empire: The princess and the bear". The Economist. 20 February 2010. Retrieved 8 January 2013.
- Chu, Monique (18 April 2002). "Veteran diplomat tells it like it was". Taipei Times. Retrieved 27 October 2012.
- "New Roving Ambassador Nuala O' Loan to Travel to Timor". Irish embassy. 10 March 2008. Archived from the original on 16 February 2012. Retrieved 8 January 2013.
- "Live Mint". Live Mint. 21 November 2013. Retrieved December 12, 2014.
- Mower, Sarah (2002). Oscar: The Style, Inspiration and Life of Oscar De La Renta. New York: Assouline. p. 12.
- "Roving Ambassador for South Caucasus –". Ministry for Foreign Affairs of Finland. 18 October 2012. Retrieved 8 January 2013.
- "Strobe Talbott: Richard von Weizsäcker Distinguished Visitor – Class of Spring 2009". American Academy in Berlin.
- User, Super. "L'ambassadeur". www.ambassaderca.be (in French). Retrieved 2018-02-22.