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William A. O'Neill | |
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| 84th Governor of Connecticut | |
| In office December 31, 1980 – January 9, 1991 | |
| Lieutenant | Joseph J. Fauliso |
| Preceded by | Ella Grasso |
| Succeeded by | Lowell Weicker |
| 102nd Lieutenant Governor of Connecticut | |
| In office January 3, 1979 – December 31, 1980 | |
| Governor | Ella Grasso |
| Preceded by | Robert Killian |
| Succeeded by | Joseph J. Fauliso |
| Member of the Connecticut House of Representatives from the 34th district | |
| In office January 3, 1973 – January 3, 1979 | |
| Preceded by | Robert J. Vicino |
| Succeeded by | Dean P. Markham |
| Member of the Connecticut House of Representatives from the 52nd district | |
| In office January 4, 1967 – January 3, 1973 | |
| Preceded by | District created |
| Succeeded by | Peter F. Locke Jr. |
| Personal details | |
| Born | William Atchison O'Neill August 11, 1930 Hartford, Connecticut, U.S. |
| Died | November 24, 2007 (aged 77) East Hampton, Connecticut, U.S. |
| Resting place | Connecticut State Veterans Cemetery Middletown, Connecticut |
| Political party | Democratic |
| Spouse |
Nikki O'Neill (m. 1962) |
| Profession | Legislator |
| Military service | |
| Allegiance |  United States |
| Branch/service |  United States Air Force |
| Years of service | 1950–1953 |
| Battles/wars | Korean War |
William Atchison O'Neill (August 11, 1930 – November 24, 2007) was an American politician and member of the Democratic Party who served as the 84th Governor of Connecticut from 1980 to 1991. He was the second longest-serving governor in Connecticut history, with 10 years in office.