The Kempton-Wace Letters was a 1903 epistolary novel written jointly by Americans Jack London and Anna Strunsky, then based in San Francisco, California.

The novel presents a discussion of the philosophy of love and sex, written in the form of a series of letters between two men, "Herbert Wace," a young scientist, and "Dane Kempton," an elderly poet.

Kempton makes the case for feeling and emotion, while Wace proceeds "scientifically" and analyzes love in Darwinian terms: I purpose to order my affairs in a rational manner....Wherefore I marry Hester Stebbins.

Nor does the unnamed author infuse into either Wace or Kempton anything to give human personality or appeal.... As a story [it] falls flat; as a discussion of a topic as old as interesting, as overworked.

"[2] Joseph Noel says that George Sterling described London's portion of the book, as "a spiritual misprint, a typographical error half a volume long" and says "His vocabulary, in the letters of Herbert Wace, sounds as if taken that day from an encyclopedia by a conscientious sophomore.