"Il mio sbaglio più grande" (English: My biggest mistake) is the second single of Italian singer Laura Pausini's Tra te e il mare.

The song is translated into Spanish under the title "Un error de los grandes".

On her English-language album From the Inside, the song has an English version (which originated both the Italian and the Spanish versions) named "Every Day Is a Monday", which is also included on her greatest hits album 20 - The Greatest Hits.

The music video of "Il mio sbaglio più grande" was shot in Milan and was directed by Marco Salom.

The video shows Laura Pausini with her band on a stage in front of a live audience.