Nass may refer to:
in Canada
- Nass River in northern British Columbia
- People of the Nass, the Nisga'a people of northern British Columbia
- Nass, the Nisga'a language
as an acronym
- National Association of Steel Stockholders now The National Association of Steel Service Centers, UK Steel Trade Association
- National Asylum Support Service, in the UK
- North American Spine Society, which publishes The Spine Journal
- National Association of Secretaries of State, an association of United States Secretaries of State
- National Association of Stable Staff, in the UK
- National Agricultural Statistics Service
- North American Sundial Society
other uses
- Nass (Islam), an Arabic word meaning "a known, or clear, legal injunction"
- NaSSA, or Noradrenergic and specific serotonergic antidepressant