"Notion" is a song by American rock band Kings of Leon. The song was released as the fourth single (fifth in Australia) from their album, Only by the Night, on June 29, 2009. The song reached number one on the Billboard Alternative Songs chart for one week in September 2009, knocking off the year's most successful song, "New Divide" by Linkin Park.
A music video was shot as a promotional effort for the single and was released on June 1. The director was Phil Griffin. .