Undine Spragg (uhn-DEEN sprag), an insatiably ambitious young woman whose beauty gains for her a place in society, four marriages, each more materially profitable than the last, and, finally, a desire for a fifth marriage to which she cannot attain because of her divorces.
Elmer Moffatt, Undine’s vulgar, outspoken first husband. Forced by Undine’s parents to get a divorce early in his marriage, Moffatt goes to New York, where he becomes a significant financial figure. Later, as one of the richest men in the city, he remarries Undine and becomes her fourth husband.
Ralph Marvell, Undine’s second husband. Disillusioned by his wife’s ruthless desire for money and her insatiable social ambitions, he takes his own life.
Raymond de Chelles
Raymond de Chelles (shehl), a French comte and Undine’s third husband. When he begins to neglect her, she divorces him and remarries the now-wealthy Moffatt.
Jim Driscoll, American ambassador to England and an old society acquaintance of Undine. She aspires to become his wife.
Peter Van Degen
Peter Van Degen, Undine’s lover, who deserts her in Paris when he learns of her callous treatment of Ralph.
Paul Marvell, son of Undine and Ralph.
Laura Fairford, Ralph’s sister.
Clare Dagonet (da-goh-NAY), Ralph’s cousin and the wife of Peter Van Degen.
Mr. Spragg, Undine’s father. He is forced by Moffatt to invest money to further Moffatt’s early financial career.