In Finnish mythology, Tuoni (Finnish pronunciation: [ˈtuo̯ni]) was the god of Tuonela (the underworld), and darkness personified. He was the husband of Tuonetar. Their children included Kipu-Tyttö, Tuonenpoika, and Loviatar, who were divinities of suffering. When in human form, he appears as an old man with three fingers on each hand and a hat of darkness.
- Parker, Janet; Stanton, Julie, eds. (2004). Mythology Myths, Legends, & Fantasies. Global Book Publishing. p. 253. ISBN 9780785817901.
- Aldrington, Richard; Ames, Delano, eds. (1959). Larousse Encyclopedia of Mythology. Prometheus Press. p. 316. ISBN 1566195705.
- Bonser, Wilfrid (1928). "The Mythology of the Kalevala, with Notes on Bear-Worship among the Finns". Folklore. 39 (4): 344–358. doi:10.1080/0015587X.1928.9716794. JSTOR 1255969.