HF or Hf may be:

• Hafnium, a chemical element
• Hapagfly, a German airline with an IATA code of "HF"
• Hartree-Fock, a calculation scheme
• Heritage Front, a white supremacist and Canadian Nationalist group.
• High frequency, the range of radio frequencies, from 3 MHz to 30 MHz
• Higher Preparatory Examination (HF), a Danish examination programme
• Hydrofluoric acid, a highly corrosive solution of hydrogen fluoride in water

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