Denis O'Brien (politician)

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Denis O'Brien
Denis obrien histsoc.png
Judge of the New York Court of Appeals
In office
New York State Attorney General
In office
January 1, 1884 – December 31, 1887
GovernorGrover Cleveland
David B. Hill
Preceded byLeslie W. Russell
Succeeded byCharles F. Tabor
Personal details
Born(1837-03-13)March 13, 1837
Ogdensburg, New York
DiedMay 18, 1909(1909-05-18) (aged 72)
Watertown, New York
Nationality United States
Political partyDemocratic

Denis O'Brien (March 13, 1837 – May 18, 1909) was an American lawyer and politician.


He was admitted to the bar in 1861, and commenced practice in Watertown. He was elected Mayor of Watertown in 1872.

He was New York State Attorney General from 1884 to 1887, elected on the Democrat ticket in 1883 and 1885.

In 1889, he was elected a judge of the New York Court of Appeals, was re-elected in 1903, and remained on the bench until the end of 1907 when he reached the constitutional age limit of 70 years.

He died from appendicitis at his home in Watertown.

His son John F. O'Brien also was a judge of the New York Court of Appeals.


Legal offices
Preceded by
Leslie W. Russell
New York State Attorney General
Succeeded by
Charles F. Tabor