Other Uses
- Absent Teacher Reserve, tenured teachers from closed schools, New York City
- Advanced tongue root, a phonological feature in Linguistics.
- Americans for Tax Reform, an American anti-tax advocacy group
- Andaman Trunk Road or more properly, Great Andaman Trunk Road
- Art therapist registered (ATR), denotation for a registered Art Therapist with licensure
- Atmore (Amtrak station), Amtrak station code ATR
- ATR: All Terrain Racing, a video game that Team17 developed in 1995 for the Amiga and Amiga CD32
- ATR.1 certificate, a customs document used in trade between EU members and Turkey
- ATR (company) (Auto-Teile-Ring), a German company operating in the automotive aftermarket
- Average True Range, a market volatility indicator
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