En Route is a novel by the French writer Joris-Karl Huysmans and was first published in 1895.

It is the second of Huysmans's books to feature the character Durtal, a thinly disguised portrait of the author himself.

En Route and the two subsequent two novels, The Cathedral (French: La Cathédrale) and The Oblate (French: L'Oblat), trace his conversion to Catholicism, an experience which reflects the author's own.

I've taken the principal character of Là-Bas, Durtal, had him converted and sent him to a Trappist monastery.

In studying his conversion, I've tried to trace the progress of a soul surprised by the gift of grace, and developing in an ecclesiastical atmosphere, to the accompaniment of mystical literature, liturgy, and plainchant, against a background of all that admirable art which the Church has created.