The Fremen are a group of people in the fictional Dune universe created by Frank Herbert. First appearing in the 1965 novel Dune, the Fremen inhabit the desert planet Arrakis, which is the sole known source in the universe of the all-important spice melange. Long overlooked by the rest of the Imperium and considered backward savages, in reality they are an extremely hardy people and exist in large numbers. The Fremen had come to the planet thousands of years before the events of the novel as the Zensunni Wanderers, a religious sect in retreat. As humans in extremis, over time they adapted their culture and way of life to survive and thrive in the incredibly harsh conditions of Arrakis. The Fremen are distinguished by their fierce fighting abilities and adeptness at survival in these conditions. With water being such a rare commodity on the planet, their culture revolves around its preservation and conservation. Herbert based Fremen culture, in part, on the desert-dwelling Bedouin and San People.

Dune is an American science fiction media franchise that originated with the 1965 novel Dune by Frank Herbert and has continued to add new publications. Dune is frequently described as the best-selling science fiction novel in history. It won the inaugural Nebula Award for Best Novel and the Hugo Award in 1966 and was later adapted into a 1984 film, a 2000 television miniseries, and a two-part film series with the first film in 2021 and a sequel in 2024. Herbert wrote five sequels, the first two of which were concomitantly adapted as a 2003 miniseries. Dune has also inspired tabletop games and a series of video games. Since 2009, the names of planets from the Dune novels have been adopted for the real-world nomenclature of plains and other features on Saturn's moon Titan.