Hafnium, a chemical element

Hartree-Fock, a calculation scheme

Heraldo Filipino, the official student newspaper of De La Salle University-Dasmariñas

Limited liability company (Hlutafelag), in Iceland

Højere Forberedelseseksamen ("Higher Preparatory Examination"), a Danish examination programme

High frequency, the 3-30 MHz range of radio frequencies

Heritage Front, a white supremacist and Canadian Nationalist group

Hydrofluoric acid, a highly corrosive solution of hydrogen fluoride in water

Hydrogen fluoride, a diatomic compound which can dissolve in water to form hydrofluoric acid

Have Fun, common Internet slang

Herford (district), a german district

Health Trust (Helseforetak), a Norwegian hospital enterprise

Hapag-Lloyd Flug, a German airline (IATA code) doing business as TUIfly

Hard-Fi, An English indie rock band