A Tale of the Secret Saint (転生した大聖女は、聖女であることをひた隠す, Tensei Shita Daiseijo wa, Seijo de Aru Koto o Hitakakusu) is a Japanese light novel series written by Touya and illustrated by chibi.

It initially began serialization on the user-generated novel publishing site Shōsetsuka ni Narō in January 2019.

Trying to love the simple life of a knight while hiding she is the Grand Saint, Fia ponders "If I use such a power, will we be caught and killed once again..." Written by Touya, A Tale of the Secret Saint began serialization on the user-generated novel publishing website Shōsetsuka ni Narō on January 6, 2019.

[5] A spin-off light novel series, titled A Tale of the Secret Saint ZERO, began publication on July 15, 2022.

[5] A manga adaptation of the A Tale of the Secret Saint ZERO spin-off series illustrated by Shiina began serialization on October 19, 2023.