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 Everyday 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 sister of Laura Pausini, Silvia Pausini makes a brief appearance in the video. The video shows Laura Pausini with her band on a stage in front of a live audience.