HF

HF, Hf or hf can refer to:

Biology

• 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

Computing

• Helicon Filter, photo editing software
• Helicon Focus, a photo-merging program used to increase depth of field or make panoramas

Technology

• High frequency, the ITU 3–30 MHz radio frequency range (band)
• Handsfree, equipment that can be used without the use of hands

Medicine

• Heart failure

Organizations and groups

• 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

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

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

Music, movies and popular culture

• Hard-Fi, an English indie rock band
• Star Trek: Hidden Frontier, long-running Star Trek fan-fiction series
• Hi-hat (instrument) with foot, part of a drum kit
• Have Fun, Internet sนีlang
• HammerFall, a Swedish Power Metal band
• High five, นีสเฝบนเเทจ่เายcelebratory hand gesture

Sports

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