Joseph Aaron Whitehorn (April 7, 1879 – January 23, 1926) was a Romanian-American lawyer and politician from New York who served as a Socialist member of the New York State Assembly from 1918 to 1919.

Life Whitehorn was born in the Principality of Romania in 1879.New York Red Book (1917; pg. 196) After the death of his mother, when he was about ten years old he emigrated together with his three years older brother to the United States. They lived in New York City where Joseph became a paperboy, and some years later a clerk in a clothing factory. While working during the day, he attended the evening course at New York University School of Law, graduated in 1904, was admitted to the bar, and began the practice of law in Manhattan. The next year he moved to Brooklyn.TWO SOCIALISTS ARE SENT TO ASSEMBLY FROM KINGS COUNTY in the Brooklyn Daily Eagle on November 9, 1916

Whitehorn was a member of the Socialist Party of America. In November 1916, he was elected to the New York State Assembly (Kings Co., 21st D.), defeating the incumbent Democrat Isaac Mendelsohn. Whitehorn was a member of the 140th New York State Legislature in 1917. Mendelsohn contested Whitehorn's election,TRIES TO OUST WHITEHORN in the New York Times on February 15, 1917 but the Assembly decided in favor of Whitehorn.Whitehorn Keeps His Place in the New York Times on April 6, 1917 In November 1917, after re-apportionment, he was re-elected to the Assembly in the 14th District of Kings County, and was a member of the 141st New York State Legislature in 1918. The Citizens Union called Whitehorn an "able and effective" legislator.UNION PASSES ON MORE LEGISLATORS in the New York Times on June 18, 1918 In November 1918, he ran for Congress in the 3rd District,SOCIALISTS FOR CONGRESS in the New York Times on June 23, 1918 but was defeated by Republican John MacCrate who had also won the Democratic primary.MACCRATE NAMED BY DEMOCRATS in the Brooklyn Daily Eagle on September 4, 1918

In November 1925, Whitehorn ran unsuccessfully for the New York Supreme Court (2nd D.), polling 17,568 votes.SOCIALIST VOTE IN BORO in the Brooklyn Daily Eagle on November 4, 1925

Whitehorn died of a brain aneurysm on January 23, 1926. He was survived by his wife Sarah and three sons.

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