UGS is a three letter acronym meaning:
- Underground gas storage, see natural gas storage
- UGS Corp., a private company specializing in Product Lifecycle Management software.
- Unattended Ground Sensors
- Union de la gauche socialiste (Union of Socialist Left), a defunct French left-wing party.
- Unsolicited Grant Service, one of the five QoS service types defined in the IEEE 802.16 WiMAX.
- Urmston Grammar, grammar school in Greater Manchester, England.
- Utah Genealogical Society