"No Reason" is the fourth single and second track by the Canadian rock band Sum 41, from their fourth studio album Chuck (2004). It was released in the United States and Europe as a promotional single. The song is the main track of the soundtrack of the movie Dirty Love. Before the movie's premiere, Sum 41 released an unofficial music video for the single as a promotion for the movie, showing the band's scene in the movie where they play live, along with various other scenes from the movie. It was the band's last single before the departure of Dave Baksh in May 2006.