"Ugly Heart" is the second single by American-British-Canadian girl group G.R.L. from their self-titled EP. The song features songwriting credits from Ryan Baharloo, Ester Dean, Lukasz Gottwald, John Charles Monds and Henry Walter, with production credits from Gottwald and Walter under their production monikers, Dr. Luke and Cirkut. The song was released on June 3, 2014 as the lead single from the EP. "Ugly Heart" is a guitar-driven pop song that also uses a ukulele to give it a country vibe.

The track centers on a guy who initially appears beautiful on the outside, but later displays his ugly side. The group thought a lot of women would be able to relate to the song and hoped it would inspire them to find someone who would treat them well. The song was met with general acclaim from critics. The song's accompanying music video was directed by Chris Marrs Piliero. It depicts the girls being arrested by the police, after they tattoo the word "ugly" on a man's face. It was watched 2.5 million times in less than a week following its release.

"Ugly Heart" was the last single to be released by the group before band member Simone Battle's death on September 5, 2014.

The song received renewed interest in October 2016 when British girl group Little Mix released their latest single "Shout Out to My Ex," from their fourth studio album Glory Days. Some people said that the choruses of the two songs had similarities.

Group member Paula Van Oppen explained that "Ugly Heart" was about ending a relationship with a guy who initially appeared to be nice on the outside, but once you got to know him well, the ugly side to his personality came out. Van Oppen said the inspiration for the song "was giving that message of strength and confidence and being a good person, inside and out. Not just having the exterior surface be all that you are." Natasha Slayton hoped the track would inspire people to date someone who treated them well, instead of dating someone because of their beauty.Simone Battle commented that the track felt personal to her, as it reminded her of a time when she had crush on a guy in high school, who pretended to like her back and embarrassed her. Battle also thought there would be a lot of women who could relate to the song. While Van Oppen added that the group's songs were empowering.

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