STM, an abbreviation, may refer to:
In education:
- Master of Sacred Theology, Latin: Sacrae Theologiae Magister
In technology:
- Scanning tunneling microscope, a non-optical microscope
- Signature tagged mutagenesis, a genetic technique to create random mutants
- STMicroelectronics, an Italian-French manufacturer of electronics and semiconductors
- STM-1, Synchronous Transport Module, the basic rate of transmission of the SDH ITU-T fiber optic network
- Software transactional memory, a method of handling concurrency in multithreaded systems
- Security Task Manager, a Windows task manager alternative
- .stm, a filename extension used by:
- Belkin routers for their web administration panel
- Microsoft Exchange server Streaming Media File
- Scream Tracker music tracker software
In transportation:
- Société de transport de Montréal, the public transport provider in Montreal, Quebec, Canada
- Stamford Transportation Center, a railway station in Stamford, CT with Amtrak ticketing code STM
In other uses:
- Science Translational Medicine, a medical journal.
- Small Tactical Munition, a weapon developed by Raytheon
- Short-term memory, the capacity for holding a small amount of information for a short period of time.
- STM200, a pseudonym for Takeshi Matsumoto, musician featured in the music video game Dance Dance Revolution 5thMix
- Stabilisation Tracking Mechanism, the mirror instrument of the Stabilisation and Association Process (SAP) for Kosovo
- Science, Technology and Medicine as a collective name for these academic disciplines (as opposed to HSS, Humanities and Social Sciences)
- International Association of Scientific, Technical, and Medical Publishers, an association of publishers