Arts and entertainment
* "Flathead" EP, by The Fratellis ** "Flathead" (song), by The Fratellis * ''Flathead'' (film), a 2024 Australian film * The ruling family of the Great Underground Empire in the ''Zork'' adventure game series, such as '' Zork Zero''Peoples
* Bitterroot Salish, or Flathead people, one of three tribes of the Confederated Salish and Kootenai Tribes of the Flathead Nation in Montana *Places
* Flathead Valley, also known as The Flathead, a region of the U.S. state of Montana ** Flathead County, Montana ** Flathead High School, a school in Kalispell, Montana ** Flathead Indian Reservation, Montana **Technology
* Flathead engine, a valve configuration * Flat-head screw, a screw with a flat top, designed to be installed in a countersunk hole * Flat-head screwdriver, a screwdriver designed to turn slotted screwsZoology
Fish
* Platycephalidae, a family of fish known as flatheads ** Flathead (fish), various species of fish in this family * Flathead catfish (''Pylodictis olivaris''), a species of fish found in North America * Flathead grey mullet (''Mugil cephalus''), a fish species in the mullet family Mugilidae, widespread * Flat-headed loach (''Oreonectes platycephalus''), a species of cyprinid fish *'' Pseudaphritis urvillii'', species of fish also known as freshwater flathead and marbled flatheadOther animals
* Flat-headed cat, a small wild cat *Other uses
* The Flathead gang, also known as The Flatheads, a group of bank robbers led by Paul JaworskiSee also
* Plagiocephaly, a medical condition also known as "flat head syndrome" {{Disambiguation, geo