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'HF', 'Hf' or 'hf' can refer to:

★ Hafnium, a chemical element

★ Hartree-Fock, a calculation scheme

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

★ 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

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

★ Limited liability company (''Hlutafelag''), in Iceland

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

★ Health Trust (''Helseforetak''), a Norwegian hospital enterprise

★ Hard-Fi

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

★ Heritage Front, a white supremacist and Canadian Nationalist group

★ Have Fun, common Internet slang