Other
- Cos lettuce, a variety of lettuce
- CoyotAir (airline designator code), from Spain
- Cost of sales, the direct costs attributable to the production of the goods sold by a company
- Chicks on Speed, an electropop group which started in Munich
- Martín Perfecto de Cos (1800–1854), 19th-century Mexican general, brother in law of Presidente & General Antonio Lopez de Santa Anna
- COS (Collection of Style), a fashion line by H&M
- A nickname for comedian Bill Cosby
- Cos television series, 1976 sketch comedy hosted by Cosby
- An old pet form for "cousin"
- Informal abbreviation for the book Harry Potter and the Chamber of Secrets
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