Charles Cahier (26 February 1807 – 26 February 1882) was a French antiquarian, born Paris on February 26, 1807.
He made his preparatory studies at the College of Saint-Acheul, and entered the Society of Jesus (the Jesuits) on September 7, 1824.
For some years he taught successively in its colleges at Paris, Brig in the Swiss canton of Valais, at Turin, and at Brugalette in Belgium.
The greater part of his life, however, was devoted to the collection, classification, and interpretation of the countless treasures of medieval art surviving in France, Belgium, Germany, and elsewhere in Europe.
In spite of his numerous digressions and parentheses, says Father Brucker, and a somewhat neglected style, Father Cahier is never wearisome; a vein of kindly but caustic humor runs through his pages, in which about pungent words and phrases, dictated, however, by candour and the love of truth.
He was deeply versed in all kinds of curious medieval lore, and particularly in the "people's calendar" or every-day usages and customs connected with the liturgical life of the Church.