| Titles | MS and Item no. | IMEP volume |
|---|---|---|
| De coitu | Trinity R.14.52 [13] | 11 |
| De collacione fienda | Wor Q. 56 [A 83] | 15 |
| 'De coloribus' | Rawl D 1210 [1] | 23 |
| 'De coloribus' | Trinity O.2.47 [1] | 11 |
| 'De coloribus urine' | CUL Dd.6.29 [19] | 19 |
| De comitis | Trinity O.5.26 [11] | 11 |
| De comparacionibus | Peniarth 356 [5] | 14 |
| De comparacionibus | Peniarth 356 [2] | 14 |
| De comparacionibus | Rawl D 328 [3] | 23 |
| 'De complexcionibus' | Caius 457/395 [46] | 17 |
| 'De conditionibus vij planetarum' | Trinity O.1.77 [4] | 11 |
| De confessione et penitencia | Rylands Eng 86 [3] | 2 |
| De consilio trinitatis | Trinity R.3.21 [25] | 11 |
| De contemptu mundi | Ashmole 59 [5] | 9 |
| De contemptu mundi | CUL Ll.5.18 [5] | 19 |
| De contemptu mundi | HM 744 [4] | 1 |
| De contemptu mundi | Lambeth 594 [9] | 13 |
| De contemptu mundi | Laud 23 [27] | 16 |
| De contemptu mundi | Trinity B.15.39 [2] | 11 |
| 'De contentis vrinarum' | Trinity R.14.39 [11] | 11 |
| 'De contricione' | Trinity O.8.26 [2] | 11 |
| De corio serpentis | HM 64 [31] | 1 |
| De corio serpentis | Oxf Ba 329 [3] | 8 |
| 'De corstona' | CCCC 111 [A 19] | 20 |
| De creatione | Oxf AS 24 [2] | 8 |
