Flathead

• "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

• Bitterroot Salish, or Flathead people, one of three tribes of the Confederated Salish and Kootenai Tribes of the Flathead Nation in Montana
• Choctaw, a southeastern Native American group also known as the Flatheads
• Confederated Salish and Kootenai Tribes of the Flathead Nation, known as the Flathead, or Flathead Indian (or Amerindian) tribe

• 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
• Flathead Lake, Montana
• Flathead National Forest, Montana
• Flathead River, Montana

• 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 screws

• 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 flathead

• Flat-headed cat, a small wild cat
• Flat-headed frog (Limnodynastes depressus), a species of frog found in Australia
• Flat-headed kusimanse (Crossarchus platycephalus), a species of mongoose found in West Africa
• Flat-headed myotis (Myotis planiceps), a species of vesper bat found in Mexico
• Flat-headed salamander (Desmognathus planiceps), a species of salamander found in the US
• Flat-headed shrew (Crocidura planiceps), a species of mammal found in Africa

• The Flathead gang, also known as The Flatheads, a group of bank robbers led by Paul Jaworski

• Plagiocephaly, a medical condition also known as "flat head syndrome"

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