Lily Catherine Gladstone (born August 2, 1986) is an American actress. Raised on the Blackfeet Reservation, Gladstone is of Piegan Blackfeet, Nez Perce, and European heritage. She earned critical acclaim for portraying Mollie Kyle, an Osage woman who survived the Osage Indian murders, in Martin Scorsese's crime drama film Killers of the Flower Moon (2023), receiving several accolades; she became the first Native American to win the Golden Globe Award for Best Actress in a Motion Picture – Drama and be nominated for the Academy Award for Best Actress.

Gladstone made her feature film debut in Jimmy P: Psychotherapy of a Plains Indian (2012) and collaborated with filmmaker Kelly Reichardt on the independent films Certain Women (2016) and First Cow (2019). She also appeared in episodes of HBO's Room 104 (2017–2020), Showtime's Billions (2016–2023), and FX's Reservation Dogs (2021–2023). Her performance in the crime drama miniseries Under the Bridge (2024) earned her a nomination for a Primetime Emmy Award.