Books about Triangles (Interpersonal relations) -- Fiction (sorted alphabetically)
- Which? Or, Between Two Women Ernest Daudet
- Whirl Asunder Gertrude Franklin Horn Atherton
- Whirligig of Time Wayland Wells Williams
- Wild Wings: A Romance of Youth Margaret Piper Chalmers
- Wings of the Dove, Volume 1 of 2 Henry James
- Wings of the Dove, Volume II Henry James
- Wings of the phoenix John Bernard Daley
- Woodlanders Thomas Hardy
- Woodlanders Thomas Hardy
- Wuthering Heights Emily Brontë
- Zarah the Cruel Joan Conquest
- 斷鴻零雁記 (Chinese) Manshu Su