VAS is a three-letter abbreviation with multiple meanings, as described below:
- Vaccine Associated Sarcoma
- Value-added service, a telecommunications industry concept
- Vehicle activated sign, road traffic signs triggered by traffic
- Vehicle Autonomous System used for driverless cars
- Victorian Archaeological Survey government organisation in Victoria, Australia
- Victory at Sea (game), naval wargames rules published by Mongoose Publishing
- Virtual address space, a feature of modern operating systems
- Virtual asset sales, a business model for online games
- Visual analogue scale
- Visual Arts Scotland