Encyclopedias, Almanacs, Transcripts, and Maps
- Rowton, Montagu William Lowry Corry, 1st Baron
- Roxelana
- Roy, Rammohun
- royal antelope
- Royal Botanic Gardens
- Royal Danish Ballet
- Royal Highlanders
- Royal Victoria College
- Royal, Ségolène
- Roycroft Press
- Royo Sánchez, Arístides
- Rozebeke
- Rozhdestvenski, Zinovi Petrovich
- RR Lyrae
- RSFSR
- Ruapehu
- Rub al Khali
- Rubbia, Carlo
- rubeola
- Rubin, Robert Edward