Julia Carin Michaels (née Cavazos; born November 13, 1993) is an American singer and songwriter. She has received five Grammy Award nominations, including twice for Song of the Year and Best New Artist, as well as nominations from the MTV Video Music Awards, Billboard Music Awards, and American Music Awards.

Born in Iowa and raised in California, Michaels began her career writing for other artists at the age of 16. Following her success from doing so, she signed to Republic Records as a recording artist to release her 2017 debut single, "Issues". The song peaked at number 11 on the Billboard Hot 100, received quintuple platinum certification by the Recording Industry Association of America (RIAA), and preceded the release her third extended play (EP), Nervous System (2017). The EP, along with its follow-up, Inner Monologue Part 1 (2019), both moderately entered the Billboard 200. Her debut studio album, Not in Chronological Order (2021), was met with critical praise despite commercial failure.

In her songwriting career, Michaels has been credited on songs for Selena Gomez, Olivia Rodrigo, Demi Lovato, Sabrina Carpenter, Fifth Harmony, Shawn Mendes, Britney Spears, Justin Bieber, Hailee Steinfeld, and Gwen Stefani, among others. She has earned two Billboard Hot 100-number one songs with Bieber's "Sorry" and Gomez's "Lose You to Love Me". As a guest performer, she guest appeared on the singles "If the World Was Ending" by JP Saxe, "I Miss You" by Clean Bandit, and "Coming Home" by Keith Urban. In 2023, she wrote songs for Disney's centennial animated film, Wish.