HF

HF, Hf or hf can refer to:

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