Ilsey Anna Juber (/ɪlsi dʒuːbər/, IL-see JOO-bər; born April 17, 1986) is a British American singer and professional songwriter from Los Angeles, California.

Before releasing her debut album From the Valley in 2023, Juber co-wrote songs for popular artists such as Beyoncé and Miley Cyrus.

In 2018, Juber won two BMI awards for her work co-writing "Mercy" by Shawn Mendes and "In the Name of Love" by Martin Garrix and Bebe Rexha.

Other notable writing credits include "She Loves Control" by Camila Cabello, "Ocean" by Martin Garrix featuring Khalid, Rita Ora's "Let You Love Me", Robin Schulz's "Headlights", "Disarm You" for Kaskade (both of which she also provided vocal features), and the entire Lykke Li album So Sad So Sexy.

Juber’s maternal grandfather was Sherwood Schwartz, the American television producer behind Gilligan’s Island and The Brady Bunch.