USAT may refer to:
*USA Today, national daily newspaper
* USIM Application Toolkit, a standard which enables the Universal Subscriber Identity Module, USIM to initiate actions which can be used for various value-added services delivered to 3G mobile devices (USAT is the equivalent of SIM Application Toolkit, STK for 3G cellular networks)
* United States Army Transport, a designation given to United States Army troop transports; the abbreviation is placed before the name of the ship
* USA Triathlon, the national governing body for the multi-sport disciplines of triathlon, duathlon, aquathlon and winter triathlon in the United States
* Boolean satisfiability problem#Extensions of SAT, UNIQUE-SAT, a special case of the Boolean Satisfiability problem (Computer Science)
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