SMR
- MPEG-4 Part 3
- Rimba Secondary School
- San Marino
- Seattle Mountain Rescue
- Sensorimotor rhythm
- Shingled magnetic recording
- Shintō Musō-ryū
- Simón Bolívar International Airport (Colombia)
- Sites and monuments record
- Slope mass rating
- Small modular reactor
- Smethwick Rolfe Street railway station
- Snowdon Mountain Railway
- Solomon Mahlangu Regiment
- South Maitland Railway
- Specialized Mobile Radio
- Sprint medley relay
- Square matricial representation
- Standardized mortality ratio
- Stapleford Miniature Railway
- State machine replication
- Steam methane reforming
- Surface movement radar
- Swedish Resistance Movement
- Tell Kazel