"Sax" is the debut single by British recording artist Fleur East for her first studio album Love, Sax and Flashbacks (2015). It was released as the lead single from the album on 6 November 2015 by Syco Records.

In January 2016, 'Sax' was certified Gold by BPI. in September 'Sax' was certified Platinum by BPI

After being announced as the runner-up of 11th series of The X Factor, East signed a recording contract with Syco Music in January 2015. She began working on her debut studio album after the X Factor tour was over, splitting her time between London and Los Angeles to record it. During recording, she was inspired by "Uptown Funk" by Mark Ronson featuring Bruno Mars, and described the songs on the album as "very uptempo and very energetic with lots of attitude. [The album has] got loads of influences from the old school. Lots of funk, hip-hop, soul; loads of different sounds fused together. Everything about that song - the uptempo vibe, the high energy, the brass, the old school funk sound - was just right up my street. I've definitely taken a few influences from that."

In July 2015, Syco's head Simon Cowell told The Sun: "I've heard it and it's world class. She has discovered who she wanted to be. Sometimes you just spot someone who's not obvious and Fleur's a good example of that". "Sax" was originally slated for release on 23 October 2015, then on 30 October, before being finally released on 6 November 2015 to coincide with her performance of the song on X Factor.

Digital Spy's writer Lewis Corner noted that the song was clearly inspired by "Uptown Funk", but its "brassed-up chorus, sassy lyrics and funky hook means it stands tall as a potential smash hit in its own right".

The official music video for "Sax" was released on November 26, 2015. It was directed by Colin Tilley, being the most colourful music video directed by him. It shows East smiling and walking in a five-colour square tunnel, and later shows her with some dancers in a colourful changing background. On 15th June, 2016, another music video, titled "Sax in the City", was released for the song. It features East in different parts of New York City.

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