Constantin Alexandrovich Westchiloff born Константин Александрович Вещилов / Konstantin Aleksandrovich Veschilov was a Russian-American artist known for portraits, genre scenes, landscapes, and seascapes. He was also an accomplished graphic artist and set designer. Death records for Westchloff indicate that he was born in St. Petersburg, Russia, 5 December 1878, and died 23 April 1945 in New York. Some sources, including Benezit Dictionary of Artists, list the date of birth for Westchiloff as 20 November 1877.

Another source lists his date of birth as 15/28 May 1878. Another source lists his date of birth as 27 May 1878. Westchiloff latinized his name to Constantin A. Westchiloff in 1922, when he took residency in France. Westchiloff's cause of death was heart attack. He was buried 25 April 1945 in Mount Olivet Cemetery (Queens), in Maspeth, Queens, New York. One biographer has described Westchiloff as "an enigmatic character."