Eugene Delmar (born September 12, 1841, New York – died February 22, 1909, New York), was one of the leading United States chess masters of 19th century and the four-time New York State champion in 1890, 1891, 1895 and 1897. He won a match against Robert Henry Barnes with only a single draw (+7 –0 =1).
In 1953, his wife, novelist and screenwriter Viña Delmar, revealed to a reporter from "The New York Times Book Review", that all her work had been done in collaboration with him. She said: "When we're working, we discuss the plot a long time. I write a draft in longhand. Then my husband puts it through the typewriter, changing as he goes."
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