Revolution in Me is the debut studio album by British musician Siobhán Donaghy, released on 29 September 2003 by London Records. It was her first solo album following her acrimonious departure from British girl group Sugababes. When she quit the Sugababes, the band was dropped by London Records, who decided to retain Donaghy's contract as a solo artist.

Donaghy began promoting the album in early 2003 under the pseudonym Shanghai Nobody, an anagram of her name. Using the pseudonym, she issued the promotional single "Nothing but Song", and performed at small English clubs such as Dublin Castle. She reverted to her given name for the release of the album's lead single "Overrated" in June 2003, which was a top twenty hit on the UK Singles Chart. "Twist of Fate" was issued as the album's second single in September. Despite receiving positive reviews, the album was a commercial disappointment upon release, peaking at #117 on the UK Albums Chart. "Iodine" was scheduled to be issued as the third single from the album in December, but Donaghy was dropped by London Records before it was released.

A 20th anniversary edition of Revolution in Me was released on 8 December 2023. This reissue contained a bonus disc of b-sides, outtakes and alternate versions. An outtake from the album, "Pop Illusion", was released as a promotional single to support the reissue.

Donaghy was twelve years old when she signed a management contract with producer Ron Tom, who helped form British pop group All Saints in the mid-1990s. Two years later, in 1998, Donaghy became a founding member of Sugababes when Tom introduced her to Mutya Buena and Keisha Buchanan. The group signed to London Records, and their debut album One Touch was primary produced by Cameron McVey. She was sixteen years old when their first single "Overload" was released in 2000. The song and album were critical and commercial successes, with "Overload" receiving a nomination for Brit Award for British Single of the Year.

However, Donaghy acrimoniously exited the group in August 2001 during a promotional tour in Japan. Tensions between Donaghy and her bandmates were reported by numerous publications during the album's promotional cycle. Donaghy said she and Buchanan "had nothing in common at all, and we went on not to get on. She was Mutya's friend, so I ended up being the odd one out." Buchanan and Buena reportedly invented their own coded language to exclude Donaghy from conversations. Buchanan and Buena said Donaghy never returned after she "excused herself to go to the toilet" at an airport, while Donaghy said she and Buchanan had a "falling out" when in Japan. Donaghy later accused Buchanan of bullying, saying: "It was clear that there was someone in that band who never wanted me in it and that's Keisha. She never wanted me in that band and made my life a living hell." Buchanan has denied accusations of bullying other Sugababes members.

Immediately after quitting the band in Japan, Donaghy flew back home to her family in Eastcote, Middlesex. She said she suffered panic attacks and a nervous breakdown in the following months, explaining that at this point she would have been "happy never to work again. I had got to the point where I'd look in the mirror and not know who I was. I felt like I didn't have a personality. I'd lost my identity... I felt like a zombie. A dead person." She was later diagnosed with clinical depression, and prescribed anti-depressants.

Following Donaghy's departure from the Sugababes, the group was dropped by London Records, although the label opted to retain Donaghy's contract as a solo artist. She was then sued by the band's manager. Donaghy said she spent all the money she earned as a member of the band fighting the lawsuit. Several months after leaving the band, she traveled with her sister to Ibiza for a holiday, where she met Johnny Lipsey, who had produced several tracks on the first Sugababes album. On returning home, Lipsey reintroduced Donaghy to Cameron McVey, who invited her to record at his home studio in Eastcote. Donaghy then began writing material with a new team of songwriters. During this time, the Sugababes – who had replaced Donaghy with former Atomic Kitten singer Heidi Range – had a UK number one single with "Freak like Me". Donaghy commented: "If I'd still been in that band, I wouldn't have given a fuck that I was number one."

Several songs on Revolution in Me contain lyrics dealing with Donaghy's time as a member of the Sugababes. She said it contains lyrics describing "how being in the Sugababes made me feel. I learnt a lot—about how awful people can be. But it's not completely melancholy and about depression. It is positive. I was very bitter when I left the [band]. But one day I woke up and realised: shit happens. Get over it. I had enough of dwelling on it and blaming others. I felt I needed to become a better person." Yahoo! Music said the record incorporates lyrical themes of "taking stock of life, controlling your destiny and searching for support."