Books about Triangles (Interpersonal relations) -- Fiction (sorted alphabetically)
- Sundered Streams: The History of a Memory That Had No Full Stops Reginald Farrer
- Suuri illusioni (Finnish) Mika Waltari
- Tessin tarina (Finnish) Thomas Hardy
- Tess of the d'Urbervilles: A Pure Woman Thomas Hardy
- Tess of the d'Urbervilles: A Pure Woman Thomas Hardy
- Thorley Weir E. F. Benson
- Touchstone Edith Wharton
- Touchstone Edith Wharton
- Tower of Ivory: A Novel Gertrude Franklin Horn Atherton
- Trail of the Axe: A Story of Red Sand Valley Ridgwell Cullum
- Troubled Waters Bertrand W. Sinclair
- Tuhlaajapoika (Finnish) Sir Hall Caine
- Two Vanrevels Booth Tarkington
- Until Life Do Us Part Winston K. Marks
- Vain Fortune: A Novel George Moore
- Valley of the Shadow H. C. McNeile
- Val Sinestra Martha Morton
- Venus Hate John McGreevey
- Villilampaita (Finnish) Robert Hichens
- Viviette William John Locke
- Wave: An Egyptian Aftermath Algernon Blackwood
- Web of Life Robert Herrick
- Weird Picture John R. Carling
- We Three Gouverneur Morris
- What Will People Say? A Novel Rupert Hughes