Lucy Elizabeth Dacus ( DAY-kəss; born May 2, 1995) is an American singer-songwriter, guitarist, and record producer. Originally from Richmond, Virginia, Dacus first gained fame following the release of her debut album, No Burden (2016), which led to a deal with Matador Records. Historian, her second album, was released in 2018 to critical acclaim. Home Video, her third studio album, was released in 2021.

In addition to her solo work, Dacus is also a member of the indie supergroup Boygenius, with Julien Baker and Phoebe Bridgers. The band has released one studio album and two EPs to critical acclaim and widespread touring. The band won 3 Grammy Awards in 2024, including Best Alternative Music Album. They also became the first all-female band to win Best Rock Song and Best Rock Performance.

In October 2023, Rolling Stone named Dacus the 213th-greatest guitarist of all time, noting: "[her] guitar is as essential an instrument as her voice".