Quattro
- 4
- A. J. Foyt IV
- Adept Technology
- Audi Quattro
- Audi Sport GmbH
- Audi e-tron Quattro (disambiguation)
- Borland Quattro
- Char Aznable
- Cuarto (disambiguation)
- Cuatro (disambiguation)
- Jacqueline de Quattro
- Numbers (Nanoha)
- Quarto (disambiguation)
- Quatro (disambiguation)
- Quattro (four-wheel-drive system)
- Quattro Pro
- Quattro compilations
- Schick (razors)
- Southern Skies Quattro
- Windows Home Server