"Notion" is a song recorded 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.

Despite heavy radio play on BBC Radio 1, the song missed the UK Singles Chart Top 100 and peaked at #107, the first time the band had missed the UK Top 100 for a single.

[1] A music video was shot as a promotional effort for the single and was released on June 1, 2009.

It captures the band performing in a dimly-lit, debris-filled room with imploding fiery brick walls adjacent to an alleyway bordered by another brick barrier that is used by the lead singer in a manner suggestive of the Wailing Wall in Jerusalem.