Some of his notable works include:
* "As It Was and Is" (1885) - His first novel, written under the pseudonym "Sidney Luska", which explores themes of Jewish identity and assimilation in New York City.
* "The Grandison Romance" (1892) - A romantic novel set in Venice, known for its elegant prose and introspective characters.
* "The Lady Paramount" (1895) - A witty and stylish novel about a woman who challenges societal expectations.
* "My Friend Prospero" (1899) - A collection of charming short stories about an enigmatic artist and his unconventional lifestyle.
* "The Cardinal's Snuff-Box" (1900) - A historical novel set in the Italian Renaissance, known for its vivid descriptions and intriguing plot.
* "The Royal End" (1901) - A romantic novel that explores themes of love, loss, and sacrifice.
Harland is often considered a pioneer of the "New Woman" literature of the late 19th century, which focused on the evolving roles and aspirations of women in modern society. His works are known for their elegant prose, witty dialogue, and exploration of complex emotional and social themes.