PIV

PIV may refer to:

Language

 * Plena Ilustrita Vortaro de Esperanto, a dictionary of Esperanto
 * Vaeakau-Taumako (ISO 639 language code), a Polynesian language

Science and technology

 * Particle image velocimetry, an optical method of flow visualization
 * Peak inverse voltage, in electronics
 * Pentium 4 microprocessor, produced by Intel ("IV" is Roman numeral for "4")
 * Personal Identity Verification, as specified by the US federal government standard FIPS 201
 * Positive input ventilation, a type of ventilation for buildings
 * Post indicator valve, a shut-off valve for otherwise underground pipes, notably for fire sprinklers; see Glossary of firefighting equipment
 * Pivaloyl protecting group (Piv), a protecting group in chemistry
 * P = IV, the formula describing power in terms of current and voltage in electrical power

Medicine

 * Parainfluenza virus, single-stranded RNA viruses belonging to the Paramyxoviridae family
 * Peripheral intravenous catheter (PIVC), in medicine
 * Posterior interventricular artery, an artery supplying the heart

Other uses

 * Penis in vagina, a type of sexual intercourse