William T. O'Neil | |
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| Member of the New York State Senate | |
| In office 1907–1909 | |
| Constituency | 34th District |
| Member of the New York State Assembly | |
| In office 1882–1885 | |
| Constituency | Franklin County |
| Personal details | |
| Born | February 7, 1850 Brighton, New York |
| Died | May 5, 1909 (aged 59) St. Regis Falls, New York |
| Signature | .png){kind=small} |
William Thomas O'Neil (February 7, 1850 – May 5, 1909) was an American politician from New York.