"Now or Never" is a song by American singer Halsey from her second studio album Hopeless Fountain Kingdom (2017). It was released on April 4, 2017, through Astralwerks as the lead single with its music video being released simultaneously, as an instant grat with the album's pre-order. Halsey co-wrote the song with Starrah and its producers Cashmere Cat, Happy Perez, and Benny Blanco. It is a pop and dark pop song that also incorporates R&B.

Ashley Nicolette Frangipane, known professionally as Halsey, is an American singer, songwriter and actress. Noted for her distinctive singing voice, she has received several awards including three Billboard Music Awards, a Billboard Women in Music Award, an American Music Award and nominations for three Grammy Awards. She was included on Time's annual list of the 100 most influential people in the world in 2020.