Songs written by Billie Eilish

"Bad Guy" (stylized in all lowercase) is a song by American singer-songwriter Billie Eilish and the fifth single from her debut studio album, When We All Fall Asleep, Where Do We Go? (2019). It was released on March 29, 2019, through Darkroom and Interscope Records. The song was described by media as electropop, dance-pop, trap-pop, with minimalist instrumentation. In the lyrics, Eilish taunts someone for being a bad guy while suggesting that she is more resilient than they are. Eilish wrote "Bad Guy" with her brother and producer Finneas O'Connell. Another version of the song, a collaboration with Canadian singer Justin Bieber, was released on July 11, 2019.

"Never Felt So Alone" is a song by British singer-songwriter Labrinth which features uncredited vocals from American singer-songwriter Billie Eilish. It was released by Columbia Records as the second single from Labrinth's third studio album, Ends & Begins, on 7 April 2023.

"Your Power" is a song by American singer Billie Eilish. The song was released by Darkroom and Interscope Records on April 29, 2021, as the third single off of Eilish's second studio album, Happier Than Ever (2021). The song was written by Eilish and her brother Finneas O'Connell, with production being handled by the latter.

"No Time to Die" is a song by American singer and songwriter Billie Eilish. It is the theme song for the upcoming James Bond film of the same name, and was released through Darkroom and Interscope Records on February 13, 2020. The song was written by Eilish and her brother Finneas O'Connell, and recorded in a bedroom studio. At age 18, Eilish is the youngest artist to have written and recorded a James Bond theme song. The song won the Grammy Award for Best Song Written for Visual Media at the 63rd Annual Grammy Awards.

"Bellyache" is a song by American singer Billie Eilish. The song was released on February 24, 2017, through Darkroom and Interscope Records. It was written by Billie Eilish and Finneas O'Connell, with production by O'Connell. "Bellyache" is a midtempo electropop song. Lyrically, the song is written about a psychopathic murderer, and was inspired by Tyler, the Creator's song, "Garbage". The Marian Hill Remix was released on May 5, 2017.

"Bury a Friend" is a song by American singer-songwriter Billie Eilish and the third single from her debut studio album, When We All Fall Asleep, Where Do We Go? (2019). It was released on January 30, 2019, and serviced to US alternative radio stations on February 19, 2019, through Darkroom and Interscope Records. The song was described as synth-pop, electronica, electropop and industrial in press reviews, for which hip hop beats, percussion, and a synthesizer provide minimalist instrumentation. Within the dark and violent lyrics, Eilish sings from the perspective of a monster under someone's bed. Her vocals are subtle and treated with layers of vocal effects. Eilish wrote the song with its producer, Finneas O'Connell.

"You Should See Me in a Crown" is a song by American singer-songwriter Billie Eilish and the lead single of her debut studio album, When We All Fall Asleep, Where Do We Go? (2019). It was released on July 18, 2018, through Darkroom and Interscope Records. It was written by Eilish and her brother Finneas O'Connell, who also produced the track. The song received positive reviews and charted in countries including the US, Canada and Australia.

"Lovely" (stylized in all lowercase letters) is a song by American singers Billie Eilish and Khalid. Darkroom and Interscope Records released it as the lead single from the Netflix drama series 13 Reasons Whys second season soundtrack. The artists wrote the song with Eilish's brother and producer Finneas O'Connell. The song has been described as a chamber pop ballad whose lyrics recount Eilish and Khalid trying to overcome serious depression together. The song also appears on the deluxe version of Eilish's EP Don't Smile at Me.

"What Was I Made For?" is a song by American singer Billie Eilish from Barbie: The Album, the soundtrack of the film Barbie. The song was released through Atlantic Records, Darkroom and Interscope Records on July 13, 2023, as the fourth single from the soundtrack. "What Was I Made For?" reached number-one in Australia, Ireland, Switzerland, and the United Kingdom. “What Was I Made For?” did moderately well in the United States peaking at #14 on the Billboard Hot 100.

"Getting Older" is a song by American singer-songwriter Billie Eilish and the opening track of her second studio album, Happier Than Ever (2021). Featuring a minimalist production, the song is backed by pulsing synthesizers, a bass guitar, and a keyboard that plays staccato notes. Its lyrics discuss the positive and negative aspects of Eilish's transition into adulthood in the wake of her success that she first received as a teenager. Due to the subject matter, critics compared the song to Nirvana's "Serve the Servants", the opening track of their 1993 studio album In Utero. "Getting Older" contains references to sexual abuse and Eilish's childhood trauma, prompting her to take a break midway through the writing process.