Happier Than Ever is the second studio album by American singer Billie Eilish, released by Darkroom and Interscope Records on July 30, 2021. Eilish co-wrote the album with her brother and frequent collaborator Finneas O'Connell, who also produced the album and played every instrument. Eilish cited self-reflection during the COVID-19 pandemic as the biggest inspiration for the record.

Primarily a downtempo pop record, Happier Than Ever is characterized by sparse, jazz-influenced, electropop arrangements set to meditative tempos, departing from the upbeat, trap-led sound of Eilish's debut album, When We All Fall Asleep, Where Do We Go? (2019). Consisting of torch songs about the downsides of stardom, Happier Than Ever draws heavily from Eilish's rise to fame and the drawbacks that come with it. Upon release, the album received acclaim from music critics, who praised its stylistic, restrained production, and insightful lyrics. At the 64th Annual Grammy Awards, the album and its title track received a total of seven nominations, including Album of the Year, Best Pop Vocal Album, Song of the Year and Record of the Year.

Seven singles were released in promotion of the album: "My Future", "Therefore I Am", "Your Power", "Lost Cause", "NDA", the title track, and "Male Fantasy"; the first three peaked within the top 10 of the US Billboard Hot 100. "Therefore I Am" was the highest-charting song from the album, peaking at number two, followed by "My Future" at number six, and "Your Power" at number 10. Happier Than Ever debuted atop the Billboard 200 as Eilish's second number-one album in the United States, and topping the album charts in 27 other countries. Eilish performed the album's tracks in the Disney+ concert film, Happier Than Ever: A Love Letter to Los Angeles, which was released on September 3, 2021. To further promote the album, Eilish embarked on her sixth concert tour, titled Happier Than Ever, The World Tour, which began on February 3, 2022, and concluded on April 2, 2023.