VAV as a three-letter abbreviation may refer to
- A variable air volume device, used in HVAC systems to control the flow of air
- Vis-à-vis, a French expression, used as an alternative to "re" and meaning "in relation to".
Vav as a word may refer to
- Vav (letter), a Semitic letter
- Vav (protein)s, a family of guanine nucleotide exchange factors involved in cell signalling
- Vav (Gujarati and Marwari languages), a stepwell in western India or Pakistan