"In un giorno qualunque" (meaning "On an ordinary day" in Italian) is a song co-written and recorded by Italian singer Marco Mengoni. It was released on 1 October 2010 by Sony Music as the third and final single from his second extended play Re matto.
The song was written by Mengoni with co-writing contribution by Piero Calabrese. It peaked at number 5 on the Italian Singles Chart. It was also certified platinum by the Federation of the Italian Music Industry for domestic downloads exceeding 30,000 units.
A music video to accompany the release of "In un giorno qualunque" was first released onto YouTube on 18 November 2010 at a total length of three minutes and fifty-one seconds.