Encyclopedias, Almanacs, Transcripts, and Maps
- Woolly Mammoth
- Woolly Mammoth
- Worcester, Constance Rulison (1896-1986)
- Worcester, Elwood (1862-1940)
- World Charter for Nature
- World Commission on the Ethics of Scientific Knowledge and Technology
- World Congress of Faiths
- World Goodwill
- World League of Illuminati
- World Medical Association Statement on Animal Use in Biomedical Research
- World Union Journal
- Worlds Beyond (Fund)
- Worlds, Planes, or Spheres (in Theosophy)
- Wormley, Theodore George
- Wormlizards: Amphisbaenidae
- Worrall, Ambrose Alexander (1899-1972)
- Worrall, Olga Nathalie Ripich (1906-1985)
- Wound Assessment
- Wren-Warblers
- Wrens: Troglodytidae