The Song of the Red Ruby (Sangen om den røde rubin, 1956) is a Norwegian novel written by Agnar Mykle. It's a story of the young Ask Burlefot's personal ride through shame and letdowns that eventually leads to a closer and deeper understanding of himself. It was controversial in Norway at the time of publication and ended in court - as the so-called Mykle Case. This controversy was due to the explicit sexual descriptions in the adventures of the potent main character. The Song of the Red Ruby can also be viewed in connection with Lasso round the moon (novel, 1954), Tyven, tyven skal du hete (novel, 1951) and Rubicon (novel, 1965) as they all have a young man as the protagonist.

The book was later adapted into the feature film Sangen om den røde rubin (1970), directed by Annelise Meineche and starring Ole Søltoft and Ghita Nørby.