Frédéric Lucien Didier Lefort (January 6, 1850, in Sens – April 8, 1916, in Rouen, France)[1] was a French architect.

[2] Frédéric Lucien Didier Lefort was born on January 6, 1850, in Sens, Yonne, France, to Louis Lefort, an architect, and Rosalie Lucile Louise Montégu.

[4] He was elected a member of the Académie des sciences, belles-lettres et arts de Rouen in 1884.

In 1886, he was one of the founding members of the society of the Amis des monuments rouennais.

He resided in Rouen[5] and was the son-in-law of the architect Juste Lisch.