This article is about the song by Sum 41. For the song by Ginspoon, see No Reason (Grinspoon song). For the episode of House, see No Reason (House).
"No Reason" is a song by the Canadian rock group 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.