| 2601 | Rosset, Pietro (15..?-15..?) | Petri Rosseti, poetae laureati Christus, nunc primum in lucem aeditus | 1534 |
| 2602 | Rosset, Pietro (15..?-15..?) | ♦ Paulus | 1522 |
| 2603 | Rösslin, Eucharius (1470?-1526) | De partu hominis et quae circa ipsum accidunt | 1535 |
| 2604 | Royaert, Jan (1476?-1547) | Enarratio passionis Domini Nostri Jesu Christi... | 1547 |
| 2605 | Roy, Claude (15..-15..) | Hodoeporicum | 1550 |
| 2606 | Ruel, Jean (1479?-1537) | De natura stirpium Libri tres | 1536 |
| 2607 | Rufus d'Éphèse | [Des maladies des reins et de la vessie. grec ancien. 1554] Περὶ τῶν ἐν κύστει καὶ νεφροῖς παθῶν... De vesicæ renumque morbis... | 1554 |
| 2608 | Ruiz, Francisco (1480-1546) | Regulae intelligendi scripturas sacras | 1550 |
| 2609 | Rupert de Deutz (1070?-1129?) | Opera duo... | 1545 |
| 2610 | Rupeus, Hieronymus (14..?-15..) | Philadelphiarum seu lusuum fraternorum Libri duo... ♦. His accesserunt certæ quantitatum rationes | 1537 |
| 2611 | Rusio, Lorenzo (1288-1347) | Hippiatria sive Marescalia | 1532 |
| 2612 | Rutilius Lupus, Publius (01.. av. J.-C.-001.? ap. J.-C.) | De figuris sententiarum ac verborum | 1541 |
| 2613 | Ryff, Walther Hermann (1500?-1548) | Anatomica omnium humani corporis partium descriptio | 1545 |
| 2614 | Ryff, Walther Hermann (1500?-1548) | Description anatomique de toutes les parties du corps humain | 1543 |
| 2615 | Sabellico, Marco Antonio Coccio (1436-1506) | Auree Duodecim Orationes | 1509 |
| 2616 | Sabellico, Marco Antonio Coccio (1436-1506) | De rerum et artium inventoribus poema | 1513 |
| 2617 | Sabellico, Marco Antonio Coccio (1436-1506) | ♦ Epistolarum Libri duodecim summa cum diligentia impressi | 1516 |
| 2618 | Sabellico, Marco Antonio Coccio (1436-1506) | Exemplorum libri decem | 1509 |
| 2619 | Sadeler, Melchior (14..-15..) | Infantia Grammatices ♦ | 1531 |
| 2620 | Sá, Diogo de (15..-15..) | De navigatione | 1549 |
