"Souviens-toi du jour" (English: "Remember the Day") is a 1999 song recorded by French singer-songwriter Mylène Farmer.

Initially, Farmer wanted to release the ballad "Et si vieillir m'était conté" as third single from the album Innamoramento.

When I wrote this song, because (...) I have a bedside book called If This Is a Man precisely by Primo Levi, and which evokes the deportation and I wanted to talk about that (...), there are several possible readings but that's what I thought and to this idea, the need to remember these things.

"[2] However, as stated by Instant-Mag, the song is "full of hope and resolutely turned towards the potentiality of human beings to overcome its hatred", while the book seeks to "prove that the concentration camps were able to make the man inhuman, removing the brotherhood and mutual aid".

[6] In its lyrics, "Souviens-toi du jour" is "the continuation and the antithesis of "Désenchantée", and is a plea for an alternation, a sublimated power, held by an ideal".

[11] Farmer wore a dress in plastic made by Thierry Mugler which had been worn by the singer when she performed "Ainsi soit-je..." in August 1997, and which began to melt during the shooting of the video, as it had difficulty to withstand heat.

[13] This video is among the least appreciated by critics, partly due to its perceived lack of respect towards the Holocaust, as Farmer stands in suggestive positions, and her clothes are almost transparent.

[14] Farmer's position on a sofa, elbows resting on knees and head bowed as to protect herself from fire at the very end of the video, would be inspired by the text Le Brasier, written by French poet Guillaume Apollinaire,[15] in which it can be read: "Et pour toujours je suis assis dans un fauteuil (...) / Les flammes ont poussé sur moi comme des feuilles.

[22][23] "Souviens-toi du jour" was performed during the 2000 concerts tour with a simple choreography referring to the universal sign language, with her eight dancers.