"Evil Twin" is a song recorded by American singer-songwriter Meghan Trainor for her third major-label studio album Treat Myself (2020).

On February 7, 2018, Meghan Trainor tweeted that her new favorite song on her upcoming third major-label studio album was "Evil Twin".

Trainor revealed the single artwork and wrote, "You've waited long enough.. #EVILTWIN comes out Friday 😎 listen for my entire family on the backgrounds!

[4][6] Trainor stated in a January 2020 interview that Treat Myself will be an attempt to make a pop record that feels relevant in an era when hip-hop reigns, adding that she had written four albums worth of material trying to adapt to new trends in the music industry.

[10][11] Hannah Mylrea of NME described the song as "a cloying cut of electronic pop that sees Trainor try to distance herself from the sides of her that she doesn't like, blaming her indiscretions on her evil twin".

[12] Pitchfork's Dani Blum called the song "an apology from Trainor for the 'crazy bitch' side of her, which makes her 'make my bad decisions, but I'm innocent.

[11] In his review of Treat Myself, he wrote: The rollicking bop introduces us to her 'crazy bitch' alter ego after a wild night filled with regrets.