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USN may refer to:
- United States Navy
- University of Southern Nevada
- University School of Nashville
- IATA Code for Ulsan Airport in Ulsan, South Korea
- Ubiquitous Sensor Network
- USN (Update Sequence Number) Journal, a part of the NTFS file system
- United States dollar (next day) (funds code)
- Universal Space Network, a company providing space communication services
- Ultimate Sports Nutrition A company who sell sports supplements and nutritional products.
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