HV or Hv is a two-letter acronym which may refer to:
- Mitochondrial DNA Haplogroup HV
- Burkina Faso, WMO country code (from the former French name, "Haute Volta")
- Heimevernet, the Norwegian home guard
- Hemvärnet, the Swedish home mguard.
- High voltage (electricity)
- Holcomb Valley Scout Ranch
- Home video
- Hrvatska Vojska, the Croatian army
- Hudson Valley
- Hwair (ƕ), a Gothic letter, called hv in Unicode
- Hybrid vehicles
- Light (hν), in chemistry shorthand
- Transavia, IATA airline code
- Vickers Hardness, a hardness test.
- Humanae vitae, a papal encyclical.
- Hendrik Vermeulen, a South African fashion label.
- Hasselblad HV, a digital system camera based on the Sony α SLT-A99V
- Hypervelocity star, an astronomical object or as a designation of such in a star catalogue