|United States Ambassador to Honduras|
7 July 1999 – 5 September 2002
|President||Bill Clinton, George W. Bush|
|Preceded by||James F. Creagan|
|Succeeded by||Larry Leon Palmer|
Frank Almaguer (born 1945) is a United States diplomat and career Foreign Service Officer. He has served in numerous positions with the US Peace Corps, The US Agency for International Development (USAID), the United States Department of State and the Organization of American States (OAS).
Almaguer was born in Holguin, Cuba and grew up in Miami, FL.  He gained a Bachelor of Arts in Political Science from the University of Florida (1967), and a Master of Science in Government Administration from the George Washington University (1974).
Almaguer served in the US Peace Corps as a Volunteer in Orange Walk Town, Belize (1967–1969), as Associate PC Country Director in Belize (1974–1976), and as PC Country Director in Honduras (1976–1979).
From 1979 to 1983, Almaguer served as Deputy Mission Director for USAID in Panama. From 1983 to 1986, Almaguer worked for USAID in Washington, DC as Director of the Office of South American and Mexican Affairs. From 1986 to 1990, he served as USAID Mission Director in Ecuador. From 1991 to 1993, Almaguer served as USAID Regional Mission Director for Eastern Europe, based in Washington. From 1993 to 1996, he served as USAID Deputy Assistant Administrator for Human Resources and Director of Personnel in Washington. From 1996 to 1999, he served as USAID Mission Director in Bolivia.
Almaguer served as United States Ambassador to the Republic of Honduras from August 1999 until September 2002. 
Almaguer retired from the US Foreign Service with the personal rank of Career Minister in November 2002. From 2003 to 2005, Almaguer served as a Senior Adviser to the Pan American Development Foundation (PADF), United States Delegate to the 60th annual meeting of the United Nations Commission on Human Rights (UNCHR), and worked as an international consultant on economic and social development reforms.
Almaguer was appointed as Secretary for Administration and Finance at the Organization of American States (OAS) in February 2005. He retired from that position in December 2010. Almaguer is married to the former Antoinette Gallegos of Albuquerque, New Mexico, has two adult children and four grandchildren.
- Announcement of appointment as Ambassador, 16 April 1999, accessed 2 August 2009
- US State Dept, Office of the Historian, Frank Almaguer (1945-), accessed 2 August 2009