A hat is an item of clothing worn on the head.

Hat or HAT may also refer to:

Film

• The Hat (film), a 1999 short film by Michèle Cournoyer

• The Hat, a 1912 film by Rollin S. Sturgeon

• The Hat, a 1963 film by Faith Hubley and John Hubley

Mathematics

• Hat matrix, a mathematical operation in statistics

• Hat operator, notation used in mathematics

• Hat function, alternate name for the triangular function

• The hat tile, a solution to the einstein problem

Organisations

• Handball Association of Thailand, governing body of handball in Thailand

• Hutchison Asia Telecom Group, a business division in telecommunications

• Hellenic Aeronautical Technologies, a Greek aeroplane manufacturer

• Helicopter Air Transport, a defunct American helicopter operator

People

• Hat (High Priest of Osiris), the high priest of Osiris during the 19th dynasty of Ancient Egypt

• Jack McVitie (1932–1967), known as Jack "The Hat", English gangster

• Les Miles (born 1953), known as The Hat, American football coach

• Jan Åge Solstad (born 1969), known as Hat, former vocalist for the Norwegian black metal band Gorgoroth

Places

• Hať, Moravian-Silesian Region, Czech Republic

• Hat, Azerbaijan

• Hat, Nepal

• Hat, Berehove Raion, Ukraine

• Hat District, Al Mahrah Governorate, Yemen

• Hat Island (disambiguation)

Science

• Human African trypanosomiasis (sleeping sickness)

• HAt, symbol for hydrogen astatide

• Histone acetyltransferase, an enzyme class

• HAT medium, used in microbiology and immunology, for example in culturing hybridoma cells

• Hungarian-made Automated Telescope, used in the HATNet Project

Technology

• Hardware Attached on Top, expansion board format for the Raspberry Pi computer.

• Hashed array tree, in computer programming.

• Help authoring tool, software for "help" documents.

Other uses

• , an Afrikaans dictionary

• Haitian Creole language, with ISO 639-2 and 639-3 code hat

• Hat, slang for the caret (computing) (^)

• Hat, slang for the circumflex (ˆ)

• Hat (Davy Graham album), released in 1969

• Hat. (Mike Keneally album), released in 1992

• History Aptitude Test, an admissions test at Oxford University

• The Hat, a Southern California fast-food restaurant

• The Hat (book), a children's book by Tomi Ungerer

• Hat (comics), a supervillain from DC Comics

• "The Hat", an episode of Homicide: Life on the Street (season 4)

• "The Hat", an episode of Wander Over Yonder

• Hi-hat (instrument), a standard part of a drum kit

• Short for hatnote - WP:HAT (disambiguation)

See also

• Hats (disambiguation)

• Hatt (disambiguation)

• Het (disambiguation)

• Hett (disambiguation)

• Mr. Hat