HF, Hf or hf can refer to:

Arts and entertainment
HammerFall, a Swedish power metal band
Hard-Fi, an English indie rock band
Star Trek: Hidden Frontier, a long-running Star Trek fan-fiction series
Hi-hat with foot, part of a drum kit

Business
Hlutafélag (hf.), a form of limited liability company in Iceland
Hapag-Lloyd Flug, a German airline (former IATA code) doing business as TUIfly
Air Côte d'Ivoire, an Ivorian airline (IATA code)
Hedge fund

Education
Higher Preparatory Examination (HF) (Højere Forberedelseseksamen), a Danish examination programme
Heraldo Filipino, the student newspaper of De La Salle University-Dasmariñas, Cavite, Philippines
Homewood-Flossmoor High School, Flossmoor, Illinois

Organizations
Humanity First, an international charitable organisation, which focuses on immediate disaster response and long-term development
Health trust (Helseforetak), a Norwegian hospital enterprise
Heritage Front, a white supremacist and Canadian Nationalist group
Hudobný fond (Music Fund Slovakia), a presenter of the ZAI Awards

Science and technology
Biology and medicine
Heart failure
Holstein Friesian cattle, HF, a breed of cattle
Steve Biko Academic Hospital, a hospital in Pretoria, South Africa, formerly called H F Verwoerd Hospital
Hippocampal formation, region in the brain

Chemistry
Hafnium, symbol Hf, a chemical element
Hartree–Fock method, a calculation scheme in the field of computational chemistry
Hydrogen fluoride, HF, a diatomic compound which can dissolve in water to form hydrofluoric acid, a highly corrosive solution
Hydrofluoric acid, HF(aq), a solution of hydrogen fluoride (HF) in water

Other uses in science and technology
Handsfree, equipment that can be used without the use of hands
Helicon Filter, photo editing software
Helicon Focus, a photo-merging program used to increase depth of field or make panoramas
High frequency, the ITU 3–30 MHz radio frequency range (band)

Sport
Half-Forward, an Australian Rules football position
Heinz Field, a stadium in Pittsburgh, Pennsylvania and the home of the Pittsburgh Steelers

People
H. F. Verwoerd, a South African Prime Minister
Harrison Ford, American film actor

Other uses
Have Fun, in video game slang
High five, celebratory hand gesture
Hotfix, a software patch to temporarily fix a bug in a product

See also
High fidelity