HF

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 (instrument) with foot, part of a drum kit
• Heraldo Filipino, the official student newspaper of De La Salle University-Dasmariñas

In business

• HF (hlutafélag), in Iceland, a form of limited liability company
• Hapag-Lloyd Flug, a German airline (IATA code) doing business as TUIfly
• Hedge fund

In education

• Higher Preparatory Examination (HF) ("Higher Preparatory Examination"), a Danish examination programme
• Heraldo Filipino, the official student newspaper of De La Salle University-Dasmariñas
• Homewood-Flossmoor High School

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, HF), a presenter of the ZAI Awards

Science and technology

Biology and medicine

• Heart failure
• Holstein-Friesian, HF, a breed of cattle

Chemistry

• Hafnium, 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

Other uses

• Have Fun, in Internet slang
• High five, celebratory hand gesture
• Hotfix, a software patch to temporarily fix a bug in a product