- Planetary theory1
- Plautus, Titus Maccius1
- Propertius, Sextus1
- Prophecy1
- Psychology1
- Regula (Benedict, Saint, Abbot of Monte Cassino)1
- Remboîtage1
- Rhetoric1
- Rules1
- Sakkākī, Yūsuf ibn Abī Bakr, 1160- Miftāḥ al-ʻulūm1
- Satire, Latin1
- Scholasticism1
- Seneca, Lucius Annaeus, approximately 4 B.C.-65 A.D.1
- Specimens1
- Sphaera mundi (Sacro Bosco, Joannes de)1
- Stamps1
- Talkhīṣ Miftāḥ al-ʻulūm (Qazwīnī, Jalāl al-Dīn Muḥammad ibn ʻAbd al-Raḥmān)1
- Terence1
- Theoricae novae planetarum (Peurbach, Georg von)1
- Tibullus1