Jacob A. Cantor
Member of the U.S. House of Representatives from New York's 20th district
In office November 4, 1913 – March 3, 1915
Preceded by	Francis B. Harrison
Succeeded by	Isaac Siegel
3rd Borough President of Manhattan
In office January 1, 1902 – December 31, 1903
Preceded by	James J. Coogan
Succeeded by	John F. Ahearn
President pro tempore of the New York State Senate
In office 1892–1893
Preceded by	Jacob Sloat Fassett
Succeeded by	Charles T. Saxton
Member of the New York State Senate
In office January 1, 1888 – December 31, 1898
Preceded by	William C. Traphagen
Succeeded by	Thomas F. Donnelly
Constituency	10th district (1888–1893) 14th district (1894–1895) 20th district (1896–1898)
Member of the New York State Assembly from the 23rd district
In office January 1, 1885 – December 31, 1887
Preceded by	Daniel M. Van Cott
Succeeded by	Nicholas R. O'Connor
Personal details
Born	(1854-12-06)December 6, 1854 New York City, US
Died	July 2, 1921(1921-07-02) (aged 66) New York City, US
Political party	Democratic
Spouse(s)	Julia Lewenthal, Lydia Greenbaum
Children	3
Education	City College of New York
Occupation	Lawyer

Jacob Aaron Cantor (December 6, 1854 – July 2, 1921) was an American lawyer and politician from New York who served as a United States representative from 1913 to 1915.

Cantor was born at 19 Second Street in New York, the son of Henry Cantor and Hannah Cantor, both natives of London. He was a reporter for the New York World from 1872 to 1877. At the same time, he studied law at the City College of New York, graduated in 1875.

On November 2, 1891, his first wife Julia (Lewenthal) Cantor died. On September 25, 1897, he married Lydia Greenbaum, and they had three children: Margaret, Ruth and John.

Cantor was admitted to the bar and commenced practice in New York City.

He was a delegate to the 1884 Democratic National Convention. He was a member of the New York State Assembly (New York Co., 23rd D.) in 1885, 1886 and 1887. He was a member of the New York State Senate from 1888 to 1898, sitting in the 111th through 121st New York State Legislatures (all three 20th D.); and was President pro tempore from 1892 to 1893.

He was Borough President of Manhattan from 1902 to 1903, elected on the fusion ticket headed by Seth Low for Mayor of New York City, nominated by the anti-Tammany Hall Democrats, Republicans and the Citizens Union.

Cantor was elected as a Democrat to the 63rd United States Congress to fill the vacancy caused by the resignation of Francis Burton Harrison, and served from November 4, 1913, to March 3, 1915. He unsuccessfully contested the election of Isaac Siegel to the 64th United States Congress.

Afterwards he resumed the practice of law in New York City.

He was president of the New York City Department of Taxes and Assessments from 1918 until his death.

Cantor died at his home at 2345 Broadway, in Manhattan, and was buried at the Mt. Hope Cemetery in Hastings-on-Hudson, New York.

• List of Jewish members of the United States Congress

• United States Congress. "Jacob A. Cantor (id: C000125)". Biographical Directory of the United States Congress.
• [1] Political Graveyard
• [2] Obit in NYT on July 3, 1921 (stating wrong years of his majority leadership)
• [3] Obit of his first wife, in NYT on November 3, 1891