Wikipedia
VSI
VSI may stand for:
- Vertical shaft impactor, a type of impact crusher
- Vertical speed indicator, an instrument in an aircraft monitoring rate of descent or climb
- Very Short Introductions, a series of books published by Oxford University Press
- Virtual Switching Instance, in VPLS
- Voluntary Service International, the Irish branch of Service Civil International
- VMS Software Inc. A vendor/supporter of OpenVMS related software.