IV
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IV may refer to:
- In medicine, an acronym for intravenous, as in "IV drip" (or simply "IV") for intravenous drip, or "IV drug use" for intravenous drug use; see also intravenous therapy
- In cryptography, an acronym for initialization vector
- InterVarsity Christian Fellowship, a Christian ministry for college students
- the Roman numeral for 4
- Isla Vista, an unincorporated community near the Santa Barbara campus of the University of California and home to thousands of UCSB students
- In music,
- the roman numeral IV is the subdominant scale degree, chord, or diatonic function, when distinguished IV = major and iv = minor.
- In law an acronym for "inter vivos" as in inter vivos trust
- Shortened version of I've in instant messaging slang.