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- Karl Rahner, 20th-century German theologian
- Saint Bernardino Realino, pastor of Lecce
- Joseph Redlhamer, 18th-century Austrian physics professor and textbook author
- Saint John Francis Regis, French rural missionary preacher
- Karl Leonhard Reinhold
- Franz Retz, Czech 15th Superior General of the Society of Jesus
- Johann Baptist Reus, German-Brazilian religious leader
- Alexandre de Rhodes, French missionary to Vietnam; linguist
- Servant of God Matteo Ricci, Italian missionary to China, linguist and published the first Chinese edition of Euclids Elements
- Giovanni Battista Riccioli, 17th-century Italian astronomer; devised the system for the nomenclature of lunar features that is now the international standard
- Gabriel Richard, co-founder of University of Michigan, "second founder" of Detroit, first congressional representative from Michigan (then a territory, not yet a state)
- Saint Alonso Rodriguez, martyr of the Río de la Plata
- Saint Alphonsus Rodriguez, Jesuit brother; mystic
- João Rodrigues, 16th century Portuguese missionary, known in Japan as João Rodrigues "Tçuzu" (interpreter), wrote several books, including a Japanese grammar work entitled Arte da Lingoa de Iapam in 1604. He was also a organizer of the Nippo Jisho or Vocabvlario da Lingoa de Iapam, the first Japanese to Portuguese dictionary published in 1603.
- Saint José María Rubio, Spanish priest; canonized in 2003
Read more about this topic: List Of Jesuits