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William Walton Butterworth | |
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| 8th United States Ambassador to Canada | |
| In office October 4, 1962 – September 10, 1968 | |
| President | John F. Kennedy Lyndon B. Johnson |
| Preceded by | Livingston T. Merchant |
| Succeeded by | Harold F. Linder |
| 1st United States Ambassador to the European Communities | |
| In office August 10, 1961 – October 25, 1962 | |
| President | John F. Kennedy |
| Succeeded by | John W. Tuthill |
| United States Ambassador to Sweden | |
| In office July 5, 1950 – December 9, 1953 | |
| President | Harry S. Truman Dwight D. Eisenhower |
| Preceded by | H. Freeman Matthews |
| Succeeded by | John M. Cabot |
| 1st Assistant Secretary of State for Japanese Affairs | |
| In office March 28, 1950 – July 4, 1950 | |
| President | Harry S. Truman |
| Preceded by | Position established |
| Succeeded by | Position abolished |
| 1st Assistant Secretary of State for Far Eastern Affairs | |
| In office September 29, 1949 – March 28, 1950 | |
| President | Harry S. Truman |
| Preceded by | Position established |
| Succeeded by | Dean Rusk |
| Personal details | |
| Born | September 7, 1903 New Orleans, Orleans Parish, Louisiana |
| Died | March 31, 1975 (aged 71) Manhattan, New York City, New York |
| Cause of death | Cirrhosis of the liver |
| Resting place | New Orleans, Orleans Parish, Louisiana |
William Walton Butterworth (September 7, 1903 – March 31, 1975) was an American diplomat. He was United States Ambassador to Canada. Butterworth is best known for his work on Asian-American foreign relations, particularly during the clash of the communists and nationalists in post-war China. He was also instrumental in laying the groundwork for the European Union via his work with the European Coal and Steel Community and European Economic Community.