F
- Face Dancers – Creatures created by the Bene Tleilax that are able to mimic other humans exactly and go undetected by all known means, except by Bene Gesserit Truthsayers.
- Famine Times – Years after the reign of Leto II, marked by chaos and famine on many worlds, that led to The Scattering.
- Faufreluches – "The rigid rule of class distinction enforced by the Imperium. 'A place for every man and every man in his place.'"
- Fedaykin – (/fɨˈdaɪkɨn/) "Fremen death commandos; historically: a group formed and pledged to give their lives to right a wrong." Personally trained by, and fiercely loyal to, Paul Atreides. See Fedayeen.
- Fish Speakers – All-female military force created by Leto Atreides II to enforce his rule over the known universe.
- Fogwood – Wood native to Ecaz, capable of being shaped by thought alone.
- Fremen – "Native" inhabitants of Arrakis.
- Fremkit – Fremen desert survival kit. Notable contents include an inflatable stilltent, a sand snorkel, a thumper, and maker hooks.
- Futar – Primitive and fierce humanoid creatures, a genetic mix of man and cat, artificially created out in the Scattering to hunt Honored Matres.
Read more about this topic: Glossary Of Dune Terminology