USM may stand for:
- Samui Airport, in Thailand (IATA airport code)
- Ultimate Soccer Manager
- Ultimate Spider-Man
- Ultrasonic motor, the motor drive used in some Canon EF and EF-S lenses
- Union of Monaco Trade Unions (Union des Syndicats de Monaco)
- United States Marines
- United States Military
- United States Mint
- Universal Storage Media
- Universal Subscription Mechanism, a protocol for RSS
- United States of Mind, a band
- Unlisted Securities Market
- Unsharp masking, an image processing method
- United Socialist Movement, UK, 1934-1965
- User-based Security Model, a security standard for the Simple Network Management Protocol
- Ultrasonic machining.
Read more about USM: Universities