Theodoric of Chartres (or Thierry of Chartres) was a twelfth-century philosopher and younger brother of Bernard of Chartres. He appears first as a master in 1121, when he spoke in support of Peter Abelard at the latter's trial for heresy at Soissons. In the 1130s he was teaching the arts in Paris, and in 1142 he became chancellor at Chartres. He attended the trial of Gilbert of Poitiers at Rheims in 1148 and shortly afterward became a monk. The date of his death is unknown.

Theodoric's rhetorical teaching survives in a commentary on Cicero's De Inventione. Three versions of his exposition of Boethius's De Trinitate and a fragmentary exposition of Boethius's De Hebdomadibus are also extant, as is a commentary on the beginning of the book of Genesis (the De Sex Dierum Operibus). In the last-named work Theodoric's Platonizing cosmology and his mathematical bent found their expression...