- Delta Air Transport , now known as Brussels Airlines
- DAT Danish Air Transport , a Danish domestic and international airline.
- , the Dutch word for "That".
- Dat Phan , Stand Up Comedian
- Data Access Technology , A Private Consulting Company business.
- Day After Tomorrow , a J-Pop band.
- Dental Admission Test , a Standardized Test used for admission to Dentistry programs in North America
- Diet As Tolerated , a medical jargon
- Differential Aptitudes Tests , a battery of psychological tests, designed to measure a person’s current level of skill with respect to the area tested.
- Digital Audio Tape
- Direct Antiglobulin Test , a laboratory test performed by blood banks
- Direct Agglutination Test —a class of diagnostic tests that look for antibody against the infecting organism.
- DAT Poker , (Domestic Asian Tournaments)
- Dolphin-assisted Therapy , a form of therapy for various psychological and neurological conditions using Dolphins .
- Dopamine Transporter , a type of molecular transporter in the brain. , dopamine active transport scan
- The UK Government's Drug Action Team
- is a File Extension used in the Microsoft Windows Operating System to mean "data"
- DAT (record Company) , a record label
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