Edward Perry Warren (January 8, 1860 – December 28, 1928) was an American millionaire, art collector and the author of works proposing an idealized view of homosexual relationships. He is now best known as the former owner of the Warren Cup in the British Museum.

Warren was born on January 8, 1860, in Waltham, Massachusetts, one of five children born into a wealthy Boston, Massachusetts, family. He was the son of Samuel D. Warren (1817–1888), who founded the Cumberland Paper Mills in Maine, and Susan Cornelia Clarke (1825–1901), the daughter of Dorus Clarke. He had four siblings: Samuel Dennis Warren II (1852–1910), lawyer and businessman; Henry Clarke Warren (1854–1899), scholar of Sanskrit and Pali; Cornelia Lyman Warren (1857–1921), philanthropist; Fredrick Fiske Warren (1862–1938), political radical and utopist.

Ned Warren received his B.A. from Harvard College in 1883 and later studied at New College, Oxford, earning his MPhil in Classics. His academic interest was classical archeology. At Oxford he met archeologist John Marshall (1862–1928), with whom he formed a close and long-lasting relationship, though Marshall married in 1907, much to Warren's dismay. Beginning in 1888, Warren made England his primary home. He and Marshall lived together at Lewes House, a large residence in Lewes, East Sussex, where they became the center of a circle of like-minded men interested in art and antiquities who ate together in a dining room overlooked by Lucas Cranach's Adam and Eve—a gift of Harold W. Parsons—now in the Courtauld Institute of Art. One account said that "Warren's attempts to produce a supposedly Greek and virile way of living into his Sussex home" resulted in "a comic mixture of apparently monastic severity (no tea or soft chairs allowed) and lavish living."

Warren spent much of his time in Continental Europe collecting art works, many of which he donated to the Museum of Fine Arts, Boston, assembling for that institution the "largest collection of erotic Greek vase paintings" in the U.S. He has been described as having "a taste for pornography" and was a "pioneer" in collecting it. His published works include A Defence of Uranian Love in three volumes, which proposes a type of same-sex relationship similar to that prevalent in Classical Greece, in which an older man would act as guide and lover to a younger man.

In 1900 Warren published The Prince who did not Exist, a small edition art book from the Merrymount Press, "a most beautiful specimen of workmanship" according to the New York Times.

Warren's oldest brother, Samuel D. Warren II, had left law to work in managing the family's paper mills. He managed the family trust established in May 1889 with the legal assistance of Louis D. Brandeis to benefit his father's widow and five children. Edward Warren challenged the family trust in 1906, claiming that Brandeis had structured it to benefit his law partner Samuel to the detriment of the other family members. The dispute ended with Samuel's suicide in 1910. The Warren Trust case became a point of contention during the 1916 Senate hearings on the confirmation of Brandeis to the Supreme Court, and it remains important for its explication of legal ethics and professional responsibility.

Warren purchased the ancient Greco-Roman drinking vessel known as the Warren Cup, now in the British Museum, which he did not attempt to sell during his lifetime because of its explicit depiction of homoerotic scenes.

Warren's notable friend and a frequent visitor in Lewes was the French sculptor Auguste Rodin. Warren commissioned a larger than life-size version of “Le Baiser” (The Kiss) from Rodin “in the finest possible marble” for his own private collection. Rodin had already sculpted such a group which he called “La Foi” (The Troth). Warren was very much taken with this study and commissioned Rodin to execute a further example, but to be completed to his particular specification, which differed in several respects from “La Foi” and a third example which Rodin had undertaken. The contract drawn up, specified Rodin's fee of 20,000 francs, as well as the stipulation that “the genital organ of the man must be completed”. Warren offered it as a gift to the local council in Lewes. The council displayed it for two years before returning it as unsuitable for public display. Warren's Kiss study, generally regarded today as being the finest of the three examples, is now a national treasure and displayed in the Tate Gallery in London.