Sydney Lemmon (born August 10, 1990; Los Angeles, California) is an American actress known for her roles in Fear the Walking Dead (2019), Succession (2019), Helstrom (2020), and on the theater stage. She studied BFA at Boston University (2012) and and earned an MFA from the Yale School of Drama (2017). Sydney Lemmon received a Julie Harris Scholarship. She also trained at the London Academy of Music and Dramatic Art.

Lemmon is the daughter of actor Chris Lemmon and granddaughter of Hollywood legend Jack Lemmon. She is also a singer and guitarist, writing music with her brother Jon Lemmon.