Nats or NATS can refer to:
- Nat (information), a unit of information
- NATS Holdings, the United Kingdom's main Air Navigation Service Provider (ANSP)
- National Association of Teachers of Singing
- Naval Air Transport Service
- Next-Generation Administration and Tracking System, an Affiliate Program backend
- Nihon Automobile High Technical School
- Nissan Anti-Theft System
- North Atlantic Track System
- North Avenue Trade School
- Syracuse Nationals, an NBA team currently known as the Philadelphia 76ers
- Washington Nationals, the current baseball team in Washington, DC
- Washington Nationals (disambiguation), any of a number of historical baseball teams
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