SMTH
| Acronym | Definition |
|---|---|
| SMTH | Something (IRC slang) |
| SMTH | Smooth |
| SMTH | Sumitomo Mitsui Trust Holdings, Inc. (Japan) |
| SMTH | Shui Mu Tsing Hua (bulletin board system) |
| SMTH | Signalling Maintenance Testing Handbook (railway) |
| SMTH | Shui Mu Tsinghua (Beijing university) |