| Radbod, Bishop of Utrecht |
| Radegonde (Radegund), Frankish Queen, Foundress of Holy Cross Convent in Poitiers |
| Radulph, Bishop of Bourges |
| Rafael Arnaiz Baron, Spanish Trappist Mystic |
| Rafael Guizar y Valencia, Bishop of Veracruz, Mexico |
| Rafaela Maria Porras Ayllon, Foundress of the Handmaids of the Sacred Heart of Jesus |
| Rafqa Butrusia (Rebecca Pietra) Choboq Ar-Rayes, Maronite Nun |
| Ragnulph of Arras, Martyr |
| Ragrenfreda, Founding Abbess of Dinain Abbey, Hainault, Belgium |
| Raineldis, Virgin and Martyr |
| Rainierus of Pisa, Monk, Patron of Pisa |
| Rambert (Ragnobert), Martyr |
| Ramiro of Leon, Abbot of St. Claudius Abbey, Martyr |
| Ramon Vicente Vargas Gonzalez, Mexican Priest, Cristero Martyr |
| Raphael Kalinowski |
| Rath (Rasso) Count of Andechs |
| Raymond Nonnatus, Mercedarian Priest |
| Raymond of Capua, Dominican Priest, Director and Biographer of Catherine of Siena |
| Raymond of Penafort, Dominican Priest |
| Raymund Gayard of Toulouse, Priest |
| Raynald (Reynold, Ronald), Benedictine Bishop of Nocera |
| Redemptorus of the Cross (Thomas Rodriguez da Cunha), Carmelite, Martyred in Malay |
| Regina (Reine), Virgin and Martyr |
| Regnault, 12th century French hermit, founder of the Monastery of Melinais |
| Regulus (Rieul), First Bishop of Senlis |
| Reinhold (Reinold) Monk, Martyr |
| Remacle, Founding Abbot of Stavelot/Malmedy, Bishop of Maestricht |
| Rembert, Archbishop of Bremen/Hamburg |
| Remi (Remigius) Isore’, French Jesuit Priest, Martyred in China’s Boxer Rebellion |
| Remigius (Remi), First Bishop of Rheims |
| Remigius, Bishop of Tournai |
| Renatus (Rene) First Bishop of Angers |
| Renatus, Bishop of Sorrento |
| Rene (Renatus) Goupil, North American Martyr |
| Reparata, Virgin, Martyred in Caesarea, Palestine |
| Restituta of Carthage, Virgin and Martyr, Patroness of the First Cathedral of Naples |
| Restitutus, Bishop of Carthage |
| Restitutus, Martyr |
| Reticius, Bishop of Autun |
| Revocatus of Carthage, Martyr, One of the Companions of Perpetua and Felicitas |
| Ricardo (Erminio Filippo) Pampuri, Brother Hospitaller of St. John of God |
| Richard “the King”, Confessor |
| Richard Gwyn (aka Richard White), Welsh school teacher, Martyr |
| Richard Reynolds, Priest at the Briggitine Monastery of Syon, English Martyr |
| Richard Reynolds, Priest of the Briggitine Monastery of Syon, Martyr |
| Richard Whiting, Last Abbot of Glastonbury, Martyr |
| Richard, Bishop of Chichester |
| Richard, English Bishop of Andria, Italy |
| Rigobert, Bishop of Rheims |
| Riquier (Ricarius), Confessor |
| Rita (Margarita) of Cascia, Widow and Augustinian Nun |
| Rita Amada de Jesus (Lopes Almeida), Portuguese Religious Sister |
| Ritza (Rizza) of Coblenz, nun at St. Kastor nunnery, Coblenz |
| Robert Bellarmine, Jesuit Cardinal and Theologian |
| Robert Lawrence, Carthusian Monk from the London Charterhouse, Martyr |
| Robert of Arbissel, Abbot, Founder of the Order of Fontevrault |
| Robert of Molesmes, Co-founder of the Cistercian order – from his arm |
| Robert Southwell, English Jesuit Priest, Martyr |
| Robert, Abbot of Newminster |
| Roch (Rocco) of Montpellier, Confessor |
| Rodingus (Rodin), First Abbot of Beaulieu |
| Rodolfo (Rudolph) Aquaviva, Jesuit Priest Superior, Martyred in India |
| Rodrigo (Roderick) of Cordoba, Mozarab Priest, Martyr |
| Rogelius, Martyr of Cordoba |
| Roger (Ruggiero) of Todi, Franciscan, Friend of St. Francis |
| Romacarius, Bishop of Constanza |
| Romaeus (Romeo), Carmelite Lay Brother |
| Roman Adame Rosales, Mexican Priest, Cristero Martyr |
| Romana, Virgin, Martyred at Sirmium |
| Romanos the Melodist, Syro-Greek Hymnographer |
| Romanus (Romain), Bishop of Rouen |
| Romanus of Antioch, Martyr |
| Romanus of Caesarea in Palestine, Deacon and Martyr |
| Romanus of Rome, Martyr |
| Romanus, Deacon and Martyr |
| Romanus, Martyr |
| Romanus, Ostiarius of Rome, Martyr |
| Romanus, Soldier and Martyr |
| Romaric, Abbot of Habendum |
| Romuald, Abbot, Founder of the Trinitarian Order |
| Romulus, Bishop of Genoa |
| Roque Gonzales, Paraguayan Jesuit Missionary, Martyr |
| Rosa Venerini, Foundress of the first public school for girls in Italy (in Rome) |
| Rosalia of Palermo |
| Rosaline (Rossolina) Villeneuve, Carthusian Prioress |
| Rose of Lima, Dominican Virgin |
| Rose of Viterbo, Virgin |
| Rose Philippine Duchesne |
| Rosendo (Rudesindis) Castillian Bishop |
| Rudolph of Bern, Boy Martyr |
| Rufina of Rome, Martyr |
| Rufina, Virgin martyred in Seville |
| Rufinus (Rufino), First Bishop of Assisi, Martyr |
| Rufus of Philippi, Martyr |
| Rupert Mayer, Jesuit Priest, Outspoken Opponent of the Nazis |
| Rupert, Bishop of Salzburg |
| Rusticus (Rotiri), bishop of Clermont |
| Rusticus of Paris, Priest, Martyr, Companion of St. Denis |
| Rusticus of Verona, Martyr |
| Rusticus, Bishop of Narbonne |
