"Fluorescent Adolescent" is a song by English indie rock band Arctic Monkeys. It was released as the second single from their second studio album Favourite Worst Nightmare (2007). It was released on 4 July 2007 in Japan and three days later in the United Kingdom. The song was written by Alex Turner and Johanna Bennett, Turner's girlfriend at the time, in a hotel room prior to the recording of Favourite Worst Nightmare.

"Fluorescent Adolescent" is a ballad about getting older and finding out that life isn't as fun anymore. It describes a woman who dreams of her youth while her current life is unsatisfying and boring. The song peaked at number five on the UK Singles Chart and was the 83rd best-selling song of 2007 in the United Kingdom. "Fluorescent Adolescent" is one of the band's most popular songs, and is frequently performed as a closer to their concerts. Kate Nash performed a cover of the song on 5 October 2007. It appears on Radio 1's Live Lounge – Volume 3.

The song has received a 9/10 rating from Planet Sound, becoming Arctic Monkeys' first single to do so since "I Bet You Look Good on the Dancefloor".

The music video was filmed in late April 2007 and was directed by The IT Crowd star Richard Ayoade. It features actor Stephen Graham (who previously appeared on the Scummy Man DVD and the "When the Sun Goes Down" video) as a clown. The music video premiered in the UK on 5 June 2007 on Channel 4, and was available online the next day.

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