Encyclopedias, Almanacs, Transcripts, and Maps
- Ricci, Matteo
- Richards, Ellen Henrietta Swallow (1842 – 1911) American Chemist
- Richards, Sir Viv
- Richardson, Cyril C.
- richest countries
- Rie, Dame Lucie
- Right Whales and Bowhead Whales (Balaenidae)
- Right-to-Act Legislation
- Right-to-Know
- Ringtail and Greater Gliding Possums (Pseudocheiridae)
- Riparian Land
- Risk Assessment and Management
- Risk Assessors
- Risshō Kōseikai
- Rites of Passage: African Rites
- Rites of Passage: Hindu Rites
- Rites of Passage: Jewish Rites
- Rites of Passage: Mesoamerican Rites
- Rites of Passage: Muslim Rites
- Rites of Passage: Neopagan Rites