Initialisms
- Immigration Voice, an activist organization
- Implied volatility, a term in financial mathematics
- Independent verification systems, voting machines
- Industrievereinigung, Federation of Austrian Industry
- Initialization vector, in cryptography
- Instrumental variable, in statistics
- Intellectual Ventures, a privately held intellectual property company
- Inter vivos trust, a legal instrument
- International Viewpoint, a periodical
- InterVarsity Christian Fellowship
- IV postcode area; the Inverness postcode area in the UK
- IrfanView, a software
- Irish Volunteers, a military organization
- Isla Vista, an unincorporated community near Santa Barbara, California
- Trochlear nerve, 4th cranial nerve
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