BV, B.V., Bv, bV, or bv may refer to:
- Science and medicine
- Bacterial vaginosis, the most common cause of vaginal infection
- Bed volume, the volume of material in a vessel (e.g. of a catalyst in a vessel, or stationary phase in column chromatography)
- Belch Vocalizations, the most common form of intra-group communication among the Mountain Gorilla
- Binocular vision, vision in which both eyes are used together
- Biological value, a measure of the proportion of absorbed protein from a food which becomes incorporated into the proteins of the organism's body
- Blood vessel, part of the circulatory system that transports blood throughout the body
- Breakdown voltage, the minimum voltage that causes a portion of an insulator to become electrically conductive
- Companies and organizations
- Beaulieu Vineyard, a Napa Valley winery
- Besloten Vennootschap, a type of Dutch private limited liability company
- Bicycle Victoria, an Australian bicycle advocacy organisation
- Black & Veatch, a U.S.-based engineering, consulting and construction company
- Boeing Vertol, predecessor to Boeing Rotorcraft Systems
- Blue Panorama Airlines' IATA airline designator
- Bottega Veneta, a manufacturer of luxury leather goods
- BullionVault, an internet gold bullion exchange and physical storage provider
- Bureau Veritas, a certification agency
- Mathematics and computing
- Bounded variation, a concept in mathematical analysis
- Bounding volume, computer graphics and computational geometry, a bounding volume for a set of objects is a closed volume that completely contains the union of the objects in the set
- Other
- Backing vocal, in music, a vocal harmony with the lead vocalist provided by one or more backing vocalists
- Blessed Virgin Mary (Roman Catholic), Mary, mother of Jesus, as venerated in the Roman Catholic Church
- Boiling vessel, equipment provided to an armoured vehicle for heating food or water (chiefly British)
- Book value, in accounting, the value of an asset according to its balance sheet account balance
- Bouvet Island, an uninhabited South Atlantic sub-Antarctic volcanic island
- .bv, the inactive ccTLD for Bouvet Island
- Bavarian B V, early German 2-4-0 locomotives of the Royal Bavarian State Railways
- Lohner B.V, a variant of the Lohner B.II military reconnaissance aircraft