- Romera, Carlo1
- Rondinelli, Vieri de'1
- Rosary1
- Rosh Hodesh1
- Rosh ha-Shanah--Liturgy1
- Rossi, Girolamo1
- Rossi, Girolamo de'1
- Rossi, Rosso1
- Rubrics1
- Rucellai, Donato1
- Rucellai, Filippo de'1
- Rucellai, Guglielmo de'1
- Ruffaldi, Domenico1
- Ruhāwī, Ḥusām al-Dīn, 14th cent. ʻUqūd al-jawāhir wa-durar al-mafākhir1
- Rupert, of Deutz, approximately 1075-11291
- Ruralia commoda (Crescenzi, Pietro de')1
- Rustam, Amir-zadeh, Sultan1
- Rāmizah fī ʻilmay al-ʻarūḍ wa-al-qāfiyah (Khazrajī, ʻAbd Allāh ibn ʻUthmān)1
- Sacraments1
- Sacraments (Liturgy)1