Michael Joseph "Mike" Mansfield (March 16, 1903 – October 5, 2001) was an American politician. He was a member of the Democratic Party. He served as a U.S. Representative (1943–1953) and a U.S. Senator (1953–1977) from Montana. He was the longest-serving Senate Majority Leader, serving from 1961 to 1977.
|United States Ambassador to Japan|
June 10, 1977 – December 22, 1988
|Preceded by||James D. Hodgson|
|Succeeded by||Michael Armacost|
|Senate Majority Leader|
January 3, 1961 – January 3, 1977
Russell B. Long
|Preceded by||Lyndon B. Johnson|
|Succeeded by||Robert Byrd|
|Senate Majority Whip|
January 3, 1957 – January 3, 1961
|Preceded by||Earle C. Clements|
|Succeeded by||Hubert Humphrey|
|United States Senator|
January 3, 1953 – January 3, 1977
|Preceded by||Zales Ecton|
|Succeeded by||John Melcher|
|Member of the U.S. House of Representatives|
from Montana's 1st district
January 3, 1943 – January 3, 1953
|Preceded by||Jeannette Rankin|
|Succeeded by||Lee Metcalf|
Michael Joseph Mansfield
March 16, 1903
New York City, New York, U.S.
|Died||October 5, 2001 (aged 98)|
Washington, D.C., U.S.
|Resting place||Arlington National Cemetery|
Maureen Hayes (m. 1932)
|Education||University of Montana, Tech|
University of Montana, Missoula (BA, MA)
University of California, Los Angeles
|Branch/service|| United States Navy|
United States Army
United States Marine Corps
|Years of service||1918–1919 (Navy)|
1920–1922 (Marine Corps)
Private First Class (Marine Corps)
|Battles/wars||World War I|
After retiring from the Senate, Mansfield served as U.S. Ambassador to Japan from 1977 to 1988. On retiring as ambassador, he was awarded the nation's highest civilian honor, the Presidential Medal of Freedom (1989). He won this in part for his role in the resignation of Republican President Richard Nixon. Mansfield is the longest-serving American ambassador to Japan in history.
- "Michael Joseph Mansfield". Arlington Cemetery website.
- Warnock, Eleanor (April 16, 2012). "End of an Era: Yamamoto, Top 'America Hand' Dies at 76". Wall Street Journal Japan Real Time. Retrieved April 18, 2012.