Yass can refer to a number of things:
- Catherine Yass - a painter.
- Yass, New South Wales - a town in Australia.
- Yass River - a river in the state of New South Wales, Australia.
- Yass Valley Council - a local government area (shire) in New South Wales.
- Yass (software) - a genomic local alignment tool.
- Yass (music) - a style of Polish jazz music from the 1980s and 1990s.
- Jass - a card game.
- Yazz - a British pop singer from the 1980s and 1990s.