Charlotte Staples Lewis is a fictional character on the ABC television series Lost, played by Rebecca Mader. Charlotte is introduced in the second episode of season four and is a cultural anthropologist on a mission to the island where Oceanic Flight 815 crashed. On the island, she is held hostage by one of the plane crash survivors, John Locke, but is freed when another person from her team switches places with her. She helps prevent poison gas from being released over the island, and develops a relationship with Daniel Faraday. Charlotte dies in Daniel's arms after the frequent time traveling causes her headaches to worsen into something unexplainable.

Rebecca Leigh Mader is an English actress, best known for her roles as Charlotte Lewis in the ABC series Lost, and as Zelena, the Wicked Witch of the West, on ABC's Once Upon a Time, for which she garnered critical acclaim.