Edgar Montgomery Cullen (1843 – 1922) was an American lawyer, judge, and politician from the state of New York. Cullen is best remembered as the Chief Judge of the New York Court of Appeals from 1904 to 1913.
Edgar Montgomery Cullen was born December 4, 1843 in Brooklyn, Kings County, New York, the second son of Dr. Henry J. Cullen (1805–1874) and Elizabeth McCue. He attended the Kinderhook Academy and graduated from Columbia College in 1860. After leaving Columbia, Cullen enrolled at the Rensselaer Polytechnic Institute, until his studies were interrupted by the outbreak of the American Civil War.
In 1861, he was commissioned a lieutenant in the First United States Infantry of the regular army, and in 1862 became colonel of the 96th New York Volunteer Infantry at the age of just 19. After his discharge from the Union Army, he resumed at first his engineering studies, but soon changed to the study of law, and was admitted to the bar in 1867.
Cullen became active in Democratic Party politics and served from 1872 to 1875 as an Assistant District Attorney of Kings County. In 1876 he served as a top advisor on the staff of Governor Samuel J. Tilden.
Cullen was elected as a justice of the New York Supreme Court in 1880. He was re-elected to a second 14-year term in 1894. In 1900, Culllen was one of the first three justices appointed under the amendment of 1899 to the Court of Appeals.
After the resignation of Alton B. Parker to run for President of the United States in September 1904, Cullen was appointed by Governor Benjamin Barker Odell, Jr. as Chief Judge of the Court of Appeals. In November 1904, he was elected to a full 14-year term as Chief Judge, nominated as a fusion candidate by Republicans and Democrats.