Encyclopedias, Almanacs, Transcripts, and Maps
- Ruehs, Christian Friedrich°
- Ruelf, Isaac
- Rufeisen, Joseph
- Ruffini, Ernesto
- Ruffo, Fabrizio
- Rufina, Ss.
- Rufinus of Aquileia
- Rufus of Samaria
- Rugg, John, Bl.
- Ruinart, Thierry
- Ruíz Blanco, Matías
- Ruiz de los Paños y Angel, Pedro, and Eight Companions, Bb.
- Ruíz de Montoya, Antonio
- Ruíz y Flores, Leopoldo
- Rukeyser, Merryle Stanley
- Rukeyser, Muriel
- Rule of Faith
- Rules of Law (Regulae Iuris)
- Ruma or Arumah
- Rumi, Jalaluddin (1207–1273)