IV
- IV – (s) Côte d'Ivoire (FIPS 10-4 country code; from Ivory Coast) – Four (in Roman numerals) – (i) IntraVenous (as in intravenous drip or intravenous therapy)
- IVD – (i) Internet Video Device, intra vas device
- Iveco – (p) Industrial Vehicles Corporation
- IVF – (i) In Vitro Fertilisation
- IVI – (i) Interchangeable Virtual Instrument
- IVIS – (i/a) Inter-Vehicle Information System
- IVL – (i) Inter-Visibility Line
- IVM – (i) In Vitro Maturation
- IVO – (i) In Vicinity Of
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