HF, Hf or hf can refer to: Hafnium, a chemical element Hartree–Fock, a calculation scheme in the field of computational chemistry Helicon Filter, photo editing software Helicon Focus, a photo-merging program used to increase depth of field or make panoramas High frequency, the 3–30 MHz range of radio frequencies Hydrogen fluoride, a diatomic compound which can dissolve in water to form hydrofluoric acid, a highly corrosive solution Hydrofluoric acid, has molecular formula HF H… (More on Hf)