Title
- Siddur2
- Siyāsah fī maʻrifat al-riyāsah al-maʻrūf bi-Sirr al-asrār1
- Snaith inquest record1
- Soliloquies1
- Somnium viridarii1
- Sonectorum et cantilenarum liber; Triumphorum liber ... [etc.1
- Song book1
- Song of Solomon1
- Sophologium1
- Specchio di Croce1
- Speculum Beatae Mariae Virginis1
- Speculum Christiani1
- Speculum anime1
- Speculum doctrinale2
- Speculum historiale3
- Speculum humanae salvationis3
- Speeches1
- Sphaera mundi1
- Spirto gentil magnanimo et sublime1
- Splendor paternae gloriae1